Question

For the function f(x)= 4x+12, which of the following expressions is equivalent to [f(x)]squared (sorry didn't know how to put squared using the laptop)
a.) (4x+12)squared
b.) 16(xsquared +9)
c.) 16xsquared+12
d.) (4(x+3))squared
e.)4(x+3)squared
f.)16(x+3)squared

Answer 1

type ^2 to mean squared

examples

x squared = x^2
7 squared = 7^2

Answer 2

so you want to find [f(x)]^2

Answer 3

f(x)= 4x+12

[f(x)]^2 = (4x+12)^2 ... square both sides

now you must use the FOIL rule or a table like this one



to expand out (4x+12)^2