Question

The domain for f(x) and g(x) is the set of all real numbers.

Let f(x)=3x+5 and g(x)=x^2

Find (f+g)(x)

A. x^3+5
B. 3x^2+5
C. 3x^3+5x^2
D. x^2+3x+5

Answer 1

Hello from MrBillDoesMath!

Answer:

Choice C

Discussion:

(f+g)(x) = f(x)        + g(x)

           = (3x + 5) + x^2

          = x^2 + (3x + 5)  by the commutative property

which is choice D

Thank you,

MrB