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okay should i give you the problems I have? I have three problems to do tonight.
you can always keep them to yourself and make us guess ;)
In most of the cases all you have to do is use the third binomial formula for the denominator to make it real and then separate real and imaginary part in the numerator
hahaha :) well i just joined this site so i didn't know if people are willing to do my math problems if i post them. thank you nowhereman..but these problems are a few i have left over that ive been attempting to do so many times and failing horribly. so i figure this is my best bet. here is the first question
4/81-1/x^2 ------------- 1/9+1/x (the dotted line separates the num from denom
Are you sure it's a 4? because then you can only expand it by 81x^2 and not really simlify it much
complex means something else in math terms :)
get 81x^2 as common denoms
4x^2-81 --------- 2x^2+81x
you mean 9 instead of 2, don't you?
2x^2(9) ...yeah lol
(2x-9)(2x+9) ------------- 9x(x+9)
yes! thank you so much! i have two more for you =]
is that correct? lol
YES it is correct you awesome awesome person
nowhere helped ;)
yes, thanks to both of you!
he like my jiminy cricket; ..do this, do that; why do i bother lol
x/7 - 7/x --------- 4/7 - 4/x
7x as commons
hahaha you are silly. that's a great analogy. does he follow what you say to other people often, correcting what you say?
they all do; they point out all my flaws in a vain attenpt to keep me humble ;)
hehehe keeps you in check
x^2 - 49 ------- 4x - 28 (x+7)(x-7) --------- = (x+7)/4 4(x - 7)
that is what i got :) thank you
(16/x-3) + 8 ------------- (10/x-3) +5
is that x-3 all inthe denominator?
both of the x-3s are in each of the denominators. the +8 and +5 are not. does that make sense?
multiply numerator and denominator by the factor x-3
16+8(x-3) ------------ 10+5(x-3)
(x-3) for common denoms then: 16/(x-3) + 8 ------------- 10/(x-3) +5 16 + 8x - 24 ------------- 10 +5x - 15 8x - 8 ------ 5x - 5 8(x - 1) ------- = 8/5 5(x - 1)
16+8x-24 --------- 10+5x-15
so those x-1's cancel out ?
yes right :)
its either that or we use them for beef stew stock lol
lol you're fricken hilarious dude. thanks you guys! i can sleep peacefully now!