Question

Find f(-4) if f(x)= 2x^3+x^2-13
I Have:
f(-4)
2x^3+x^2-13
2(-4)^3+-4^2-13
-128+-16-13
Now what?

Answer 1

you add like terms :D so you do -128-16-13

Answer 2

I got -125

Answer 3

so
-128
-16
-13
you add em?

Answer 4

idk i got -157

Answer 5

you could do (-128)+(-16)+(-13) if you add them

Answer 6

I thought it was -128 + 16 - 13

Answer 7

-128+-16-13
you thought the +-16 was just a plus 16 the negative cancels the positive out so it would just be negative

Answer 8

got -157 again so is tht correct??

Answer 9

I thought it (-4)^2 is 16 not -16. So then -128 +16 = -112 -13 = -125. But Blondie might be right lol

Answer 10

allea is right! i didnt look at the prob right. (-4)^2 is positive 16 :D

Answer 11

Yayy! lol

Answer 12

So its only 157 not negative

Answer 13

-125

Answer 14

No its -125. Do u need me to explain it so you can understand how i got my answer?

Answer 15

i figured it out tnx thou hun :)

Answer 16

Lol ur welcome :p

Answer 17

haha