hannalafave
12a^3-3a^2-5a+10/4a+3
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hannalafave
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long division
hannalafave
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i know u do this first |dw:1354757932663:dw|
hannalafave
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4a^2-3 divided in to 12a^2-3a^2=3a
mark_o.
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ok lets do this step by step :D
hannalafave
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ok
hannalafave
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\[12a^3-3a^2-5a+10\div4a+3\]
hannalafave
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3a^5
mark_o.
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first whats 12a^3/4a ?
hannalafave
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3a^2
mark_o.
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yes correct :D
now lets do the procedure as we are dividing numbers like in a regular way
hannalafave
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|dw:1354759034295:dw|
hannalafave
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yea i know that what it 6 or is it -6
hannalafave
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ops -6
mark_o.
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12a^3 -3a^2 -(12 a^3 +9a^2)=0 - 12a2 yes or no?
hannalafave
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yes
mark_o.
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ok continue dividing that using the correct answer :D
hannalafave
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so 12a^2-5a u need to use a 3a again
mark_o.
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remember always use parenthesis so that you can remember your sign
mark_o.
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yes correct use -3a
hannalafave
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(-3a)|dw:1354760013653:dw|
mark_o.
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- 12x^2 - 5x
-( -12x^2 - 9x )
----------------
0 + 4x yes or no?
hannalafave
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yes
mark_o.
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your -9 became +9 correct?
so -5a +9a= 4a
hannalafave
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yes so we have 4a+10 left
mark_o.
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yes continue doing division :D
hannalafave
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1 * 4a+3
mark_o.
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+ 4 a +10
-( 4a + 3 }
---------------
0 + 7=R
hannalafave
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so the answer is 3a^2-3a+1 7/4a+3
mark_o.
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yeahhh correct :D
hannalafave
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it says it's wrong =(
mark_o.
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you can re chack that by multiplying (4a^2 +3)(3a^2 -3x +1 + 7/(4x+3))
hannalafave
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its the faction
hannalafave
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fraction
mark_o.
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will you pls check the real prob again
is this it ?
12a^3-3a^2-5a+10/(4a+3)
hannalafave
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yea thats it
hannalafave
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is it -1
mark_o.
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ok lets try multiplying them to check if we arrived on it
mark_o.
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(4x+3)(3x^2 -3x +1 + 1/ (4x+3))
hannalafave
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12a^3-12a^2+4
mark_o.
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the R=7 therefore (im gonna use x instead of a here) :D
(4x+3)(3x^2 -3x +1 + 7/ (4x+3))
=12x^3 +9x^2 -12x^2 - 9x +4x +3 +7
= 12x^3 -3x^2-5x +10 or
= 12a^3 -3a^2-5a +10 correct ?
hannalafave
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the last one is correct
mark_o.
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ok R=7 maybe thats why its looks like its wrong in the beginning?
hannalafave
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it need +7/4a+3
mark_o.
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whats the answer in the book?
mark_o.
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yes correct
hannalafave
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ya but i ask it to many time so i got it wrong =(
hannalafave
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i have till12 tonight to finish these problem i'm at a lot i only need 1.4% to pass this semester
hannalafave
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the new problem is 9a^3-3a^2-3a+15/3a+2
hannalafave
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got that one right =)
mark_o.
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ok on that one whats the first guess?
mark_o.
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9a^3 / 3a= ?
hannalafave
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i got it right already i'm on 9b^2-6b-8/3b-1
hannalafave
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i got so far on this one 3b is the first
mark_o.
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ok
hannalafave
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the answer i came up with is 3b-3b- 7/3b-1
mark_o.
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nope :D
hannalafave
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no its wrong =(
mark_o.
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try again.... :D
hannalafave
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oh 3b-1b-7/3b-1
hannalafave
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-9/3b-1
mark_o.
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hmm if your answer start with 3b the next to it must not have any more variable b
because the polynomial like
ax^5 +b x^4 +cx^3 +dx^2 +ex + f
you are here -----> 3b +__? gets?
mark_o.
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the power should be in ascending or descending order :D
hannalafave
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thats right just 1
hannalafave
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descending
mark_o.
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ok good,, so whats your answer?
hannalafave
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3b-1- 7/3b-1
mark_o.
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hmm
(3b-1)(3b-1)=?
mark_o.
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i think you slipped on your R=? re check again on getting your R?
hannalafave
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9b^2-3b-3b+2=== 9b^2+-6b+2
hannalafave
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-8-(-1) =-7
mark_o.
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-3b -8
-(-3b +1)
----------
0 - ?
hannalafave
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-9
hannalafave
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i got it i got it =) thanks again
mark_o.
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ok YW :D
hannalafave
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i'm a slow learner and never did this in high school
mark_o.
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ok now you are doing good.... it just takes practice :D
hannalafave
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yea thank god this is my last semester in it......
mark_o.
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no one is a slow learner... its just depend if you are interested to it before or now or then .. :D
hannalafave
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i'm not i will not use this in my culinary classes at all!!!!!!!!!!!
mark_o.
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ive seen that you are interested to it so i did show you step by step
it doesnt mean you are slow learner..
its because you are now learning it or reviewing it ..............:D
hannalafave
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can u help me with my last one
mark_o.
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yes you will in finding the correct ratios of those thing you need to cook according to the recipe :D
hannalafave
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3-5x^2/x+2
mark_o.
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ok what is it
hannalafave
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i know u have to do this -5x^2+0x+3/x+2
mark_o.
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arrange them first in ascending order then divide
mark_o.
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yes correct go ahjead and try that
hannalafave
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ok i came up with -5x-10 -17/x-2
hannalafave
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ops +10
hannalafave
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and +17
mark_o.
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yesssssssssssss correct..............:D
mark_o.
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hmm not +17 :(
hannalafave
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yes -5x+10 -17/x-2
hannalafave
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no it says its wrong =(
mark_o.
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.this is the correct prob
3-5x^2/x+2
tyhen it should be x+2
mark_o.
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not x-2
hannalafave
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it worked =)
mark_o.
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ok always check the prob correctly thats the main key :D
mark_o.
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ok good...... :D
mark_o.
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i can see from now that youl be earning good money in your culinary class after graduating :D