Question

Given the function f(x) = 2x2 + 15, evaluate f(3)

Answer 1

replace all copies of x with 3

then evaluate and simplify

Answer 2

f(x) = 2x^2 + 15

f(3) = 2(3)^2 + 15

f(3) = ???

Answer 3

51?

Answer 4

that isnt one of my choices

Answer 5

this is the wrong way to do it

2*3^2 + 15

6^2 + 15

36 + 15

51

Answer 6

this is the right way to do it

f(3) = 2(3)^2 + 15

f(3) = 2(9) + 15 ... you exponentiate or square before you multiply

f(3) = 18 + 15

f(3) = 33

Answer 7

alright thank you!

Answer 8

you're welcome, practice practice practice with PEMDAS a lot more because it will show up a lot in algebra