anonymous
  • anonymous
Evaluate the expression below when x = -1. 2x2 − 5 x + 9
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
somebody help me please
anonymous
  • anonymous
please help me and sheppard18 these questions is what we are depending on to graduate
anonymous
  • anonymous
??

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anonymous
  • anonymous
??
anonymous
  • anonymous
hello??
Nnesha
  • Nnesha
replace x by -1
anonymous
  • anonymous
is that the answer
Nnesha
  • Nnesha
nope
anonymous
  • anonymous
whats the answer
confluxepic
  • confluxepic
Just substitute it.
Nnesha
  • Nnesha
\[2(-1)^2 -5\] substitute value and then solve !
anonymous
  • anonymous
i dont know how to substitute because we have never ever had a half decent math teacher
Nnesha
  • Nnesha
\(\color{blue}{\text{Originally Posted by}}\) @Nnesha \[2(-1)^2 -5\] substitute value and then solve ! \(\color{blue}{\text{End of Quote}}\) like this just replace x and plug -1 now solve what is square of (-1) ?
Nnesha
  • Nnesha
(-1)^2 is same as -1 times -1 = what ?
anonymous
  • anonymous
i dont know what the answer is
confluxepic
  • confluxepic
For example x=12. 3(x)+2=y 3(12)+2=y <--------------------------------- 36+2=y | 38=y | | See how I substituted x as 12 to solve the example equation? -------
Nnesha
  • Nnesha
what is -1 times -1 = ??
confluxepic
  • confluxepic
Arrow line messed up.
anonymous
  • anonymous
-1?
Nnesha
  • Nnesha
negative times negative = positive negative times positive = negative so negative 1 times negative 1 = ?
Nnesha
  • Nnesha
@sheppard18 what do you think ? -1 times -1 = ??
anonymous
  • anonymous
1?
Nnesha
  • Nnesha
yes right
anonymous
  • anonymous
1 is not a choice
Nnesha
  • Nnesha
\[2(-1)^2 -5\] \[2(1)-5 =what ??\]
Nnesha
  • Nnesha
i didn't say one is the answer
anonymous
  • anonymous
-7/8, -3/8, -1/8, -1 theses are the choices we have
anonymous
  • anonymous
-3?
confluxepic
  • confluxepic
Example: x+2=y You know that x is 1 but you need to find out y. So you put \(\color{red}{x~as~1}\) in the equation. \(\color{red}{(1)}\)+2=y. 1+2=3 so y=3. Get it?
Nnesha
  • Nnesha
yes that's right! remember PEMDAs rule Parentheses exponent MD) MULTIPLY OR DIVIDE AS ) ADD OR SUBTRACT
anonymous
  • anonymous
please just tell me the answer
anonymous
  • anonymous
were from tug valley we dont know much
Nnesha
  • Nnesha
you have to learn in order to know something
anonymous
  • anonymous
are teacher does nothing but sleep in class
anonymous
  • anonymous
and calls the office on our class because our class is so mean
Nnesha
  • Nnesha
alright thanks for joining os here we will teach u no direct answers!!
anonymous
  • anonymous
well how do i do it
Nnesha
  • Nnesha
\(\color{blue}{\text{Originally Posted by}}\) @estepp33 -3? \(\color{blue}{\text{End of Quote}}\) yes right
anonymous
  • anonymous
what about -3
Nnesha
  • Nnesha
substitute given x value which is -1 \[\huge\rm 2(-1)^2 -5 \] take square of -1 which is 1 (-1 times -1 = 1) \[2(1)-5 = ???\]
anonymous
  • anonymous
that comes out to be -3 what do we do with the -3
Nnesha
  • Nnesha
that's the answer of first one
Nnesha
  • Nnesha
i guess your question is \[\frac{ 2x^2 -5 }{ x+9 }\] right it's a fraction ?
anonymous
  • anonymous
it will be a fraction or a whole numbner
anonymous
  • anonymous
yes its a fraction i need help with the bottom now
Nnesha
  • Nnesha
so why you didn't tell me ?? use */* for fraction so we know it's a fraction
Nnesha
  • Nnesha
i thought those are 2 different expression
Nnesha
  • Nnesha
\[\huge\rm \frac{ 2\color{blue}{x^2} -5 }{ \color{blue}{x}+9 }\] just like we did before replace x by -1
anonymous
  • anonymous
would the answer be -3/8
Nnesha
  • Nnesha
that's right
anonymous
  • anonymous
i got 8
Nnesha
  • Nnesha
yes the denominator is 8
anonymous
  • anonymous
can u help me with this question The simplest form of the expression 4m−17m2−16+3m−11m2−16 has in the numerator and in the denominator.
Nnesha
  • Nnesha
and how do i know what is in the numerator and what is in the denominator use the equation and type ur question
anonymous
  • anonymous
i dont know
Nnesha
  • Nnesha
what ?
Nnesha
  • Nnesha
\[\huge\rm 4m−17m^2−16+3m−11m^2−16\] like this ?
anonymous
  • anonymous
4m-17/m^2-16+3m-11/m^2-16
anonymous
  • anonymous
that is the fraction ^
anonymous
  • anonymous
4m-17/m^2 this is the fraction
Nnesha
  • Nnesha
\[\huge\rm \frac{ 4m-17 }{ m^2 } -\frac{ 16+3m-11 }{ m^2 -16 }\] like this ?
anonymous
  • anonymous
yea
anonymous
  • anonymous
m^2-16 on both bottom sides
Nnesha
  • Nnesha
\[\huge\rm \frac{ 4m-17 }{ m^2 -16} -\frac{ 16+3m-11 }{ m^2 -16 }\] looks good ?
anonymous
  • anonymous
yes
anonymous
  • anonymous
no
Nnesha
  • Nnesha
alright type your question please
anonymous
  • anonymous
4m-17/m^2-16 + 3m-11/m^2-16
anonymous
  • anonymous
the minus sign should be plus and the 16 on top on the right shouldnt be there
Nnesha
  • Nnesha
\[\huge\rm \frac{ 4m-17 }{ m^2 -16} +\frac{ 3m-11 }{ m^2 -16 }\] find common denominator? what is common denominator ?
anonymous
  • anonymous
16
anonymous
  • anonymous
16?
anonymous
  • anonymous
??
Nnesha
  • Nnesha
1not just 16 m^2 -16 should be together \[\huge\rm \frac{ }{m^2 -16 }\] so m^2 and -16= common denominator
anonymous
  • anonymous
ok what do i do
Nnesha
  • Nnesha
now bec denominator of both fraction are same as common denominator so just carry down the value of numerator \[\huge\rm \frac{ 4m-17+3m-11 }{ m^2 -16 }\] now combine like terms 4m-17+3m -11= what ?
anonymous
  • anonymous
-21
Nnesha
  • Nnesha
how did yo uget -21 ?
anonymous
  • anonymous
i done 4-17+3-11
Nnesha
  • Nnesha
what are LIKe terms ?
Nnesha
  • Nnesha
you can't combine 4m with -17 bec there are not the same
anonymous
  • anonymous
3 and 4
Nnesha
  • Nnesha
add coefficient of same variable yes right 3m and 4m combine them
Nnesha
  • Nnesha
3m+4m =what ? -17-11= ?
anonymous
  • anonymous
7 and -28
anonymous
  • anonymous
??
Nnesha
  • Nnesha
\[ \huge\rm \frac{ 7m -28 }{ m^2 -16 }\] now factor 7m-28 what is common factor ?
Nnesha
  • Nnesha
nd apply difference of square for the denominator part \[\rm a^2 - b^2 = (a+b)(a-b)\]
anonymous
  • anonymous
what do i do with that
Nnesha
  • Nnesha
alright first factor the numerator 7m-28 what is common factor ?
anonymous
  • anonymous
is it m+4
anonymous
  • anonymous
??
Nnesha
  • Nnesha
for which one ?
anonymous
  • anonymous
the right one
Nnesha
  • Nnesha
alright 7m-28 what is common in these both terms ??
anonymous
  • anonymous
i got to go im going home
anonymous
  • anonymous
thanks for the help
anonymous
  • anonymous
we have drop down menues
anonymous
  • anonymous
menu
Nnesha
  • Nnesha
7m -28 7 is common so take it out \[7( ????)\] now divide both terms by 7 and write your answer in the parenthses
anonymous
  • anonymous
is the answer m+4
Nnesha
  • Nnesha
nope not just m+4
Nnesha
  • Nnesha
m^2 -16 = w hat ?
anonymous
  • anonymous
?
Nnesha
  • Nnesha
m^2 -16 what are factor of this equation
anonymous
  • anonymous
it said error
Nnesha
  • Nnesha
apply difference of square method \[\huge\rm a^2 -b^2 = (a+b)(a-b)\]
Nnesha
  • Nnesha
what ? who said error ?
Nnesha
  • Nnesha
apply difference of square method \[a^2 -b^2 =(a+b)(a-b)\]
anonymous
  • anonymous
the caa
anonymous
  • anonymous
calculator
Nnesha
  • Nnesha
don't use calculator take square root of first term and 2nd term |dw:1434382762154:dw|
anonymous
  • anonymous
?
Nnesha
  • Nnesha
Take square root of first term and take square root of 2nd term write ur answer in both parentheses (sqrt of 1st term PLUS sqrt of 2nd term) (sqrt of 1st term - sqrt of 2nd term ) example |dw:1434382868450:dw|
anonymous
  • anonymous
(m+1) (2-6)
Nnesha
  • Nnesha
that's an example m^2 - 16 = what ??
anonymous
  • anonymous
idk
Nnesha
  • Nnesha
difference of square method have to when both terms are perfect square root and there should be negative sign for example x^2 - 36 1st term =x^2 2nd term =36 square root of first term is =x square root of 2nd term is = 6 now write these in parentheses|dw:1434383072396:dw|

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