Question

given f(x)=-x^2+2x, find f(-3) will medal and fan :3

Answer 1

f(-3)
that means x =-3
so substitute x for -3 into f(x)=-x^2+2x

Answer 2

f(-3)=-3x^2+2(3)

Answer 3

i didn't mean that x after 3...

Answer 4

alright it should be -(-3)^2+2(-3) now solve this

Answer 5

-(-9)+-6

Answer 6

when you take even power of negative number you will always get positive answer

Answer 7

so 9+6?

Answer 8

\[\huge\rm -\color{ReD}{x}^2+2\color{ReD}{x}\]this is the function
replace x with -3 \[\huge\rm -(\color{ReD}{-3})^2+2(\color{ReD}{-3})\]
2 times -3 = ?

Answer 9

-6

Answer 10

yes right \[-(-3)^2-6\] solve

Answer 11

9-6=3

Answer 12

(-3)^2 = 9
there is a negative sign front of the parentheses

Answer 13

but you said two negatives make a positive????

Answer 14

yes right so (-3)^2 = -3 times -3= 9

Answer 15

i got 9 and i plugged it into the equation and that's how i got 3

Answer 16

\[\huge\rm\color{blue}{ -}\color{ReD}{x}^2+2\color{ReD}{x}\]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