anonymous
  • anonymous
given f(x)=-x^2+2x, find f(-3) will medal and fan :3
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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Nnesha
  • Nnesha
f(-3) that means x =-3 so substitute x for -3 into f(x)=-x^2+2x
anonymous
  • anonymous
f(-3)=-3x^2+2(3)
anonymous
  • anonymous
i didn't mean that x after 3...

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Nnesha
  • Nnesha
alright it should be -(-3)^2+2(-3) now solve this
anonymous
  • anonymous
-(-9)+-6
Nnesha
  • Nnesha
when you take even power of negative number you will always get positive answer
anonymous
  • anonymous
so 9+6?
Nnesha
  • Nnesha
\[\huge\rm -\color{ReD}{x}^2+2\color{ReD}{x}\]this is the function replace x with -3 \[\huge\rm -(\color{ReD}{-3})^2+2(\color{ReD}{-3})\] 2 times -3 = ?
anonymous
  • anonymous
-6
Nnesha
  • Nnesha
yes right \[-(-3)^2-6\] solve
anonymous
  • anonymous
9-6=3
Nnesha
  • Nnesha
(-3)^2 = 9 there is a negative sign front of the parentheses
anonymous
  • anonymous
but you said two negatives make a positive????
Nnesha
  • Nnesha
yes right so (-3)^2 = -3 times -3= 9
anonymous
  • anonymous
i got 9 and i plugged it into the equation and that's how i got 3
Nnesha
  • Nnesha
\[\huge\rm\color{blue}{ -}\color{ReD}{x}^2+2\color{ReD}{x}\]this is the function replace x with -3 \[\huge\rm \color{blue}{-}(\color{ReD}{-3})^2+2(\color{ReD}{-3})\] \[\huge\rm \color{blue}{-}(\color{ReD}{9})-6\] (-3)^2 =9 but i'm saying blue sign would stay there
Nnesha
  • Nnesha
|dw:1441923429502:dw|
anonymous
  • anonymous
ohh okay i see what you're saying now..
anonymous
  • anonymous
do you -(9)-6? or is that the answer?
Nnesha
  • Nnesha
yes right
anonymous
  • anonymous
Thank you
Nnesha
  • Nnesha
\(\color{blue}{\text{Originally Posted by}}\) @Justmeneedinghelp do you -(9)-6? or is that the answer? \(\color{blue}{\text{End of Quote}}\) yes solve that
Nnesha
  • Nnesha
np
anonymous
  • anonymous
@Nnesha i got -15 is that right?
Nnesha
  • Nnesha
yes right
anonymous
  • anonymous
okii thanks again
Nnesha
  • Nnesha
yw

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