#1

#8**+1 **

awesome explanation hectictar! ! !

ok so here's the trick for these though:

remember just like hectictar said: "Replace every x with -2"

We know that we have a function: \(g(x) = -4x^2 -3x + 2 \)

and you also need to be very careful with PEMDAS

now! plug in -2 everywhere you see x

and solve!!

essentially just think of your g(x) as your y value.......

imagine a graph and i gave you the x coordinate (which you plugged in to your g(x) shhhh) and asked you to find the y coordinate

how would you locate the y coordinate given the x coordinate of your point? :)

but what if you were given \(f(x)=3x+5x-2+x^2\)

and told to find the \(f(-3)\)

can you tell me how that would work K19? :D

Nirvana
Nov 15, 2019

#2**+2 **

g(x) = -4x^{2} - 3x + 2

Replace every x with -2

g(-2) = -4(-2)^{2} - 3(-2) + 2

Now what do you get if you calculate the right side of that equation?

hectictar Nov 15, 2019

#4**+2 **

Very close!! But be careful with your negative signs!

g(-2) = -4(-2)^{2} - 3(-2) + 2

Negative two squared is equal to positive four.

g(-2) = -4(4) - 3(-2) + 2

Negative four times positive four equals *negative* sixteen.

g(-2) = -16 - 3(-2) + 2

Negative three times negative two equals positive six.

g(-2) = -16 + 6 + 2

Now just calculate negative sixteen plus six plus two!

hectictar Nov 15, 2019