Question

If f(x) = 2x^2 - 30, find f(4). What do I do? Please show step by step thank you!

Answer 1

put 4 instead x

f(4) = 2(2)^2 - 30
= 2(2)(2) - 30
= 8 - 30
= -22

Answer 2

f(x) = 2x^2 - 30

f(4) = 2(4^2) - 30
f(4) = 2(16) - 30
f(4) = 32 - 30
f(4) = 2
basically, your just subbing in 4 for x

Answer 3

better?

Answer 4

oh I see thank you lochana! :)

Answer 5

ya thank you both.

Answer 6

@Animal<3er you should interact with the person helping you here.. :)

Answer 7

:D

Answer 8

that was pretty easy just forgot how to do this but, thanks to you to I remember now.