Question

Find f(5). f(x) = x2 + 2x A)15 B)20 C)30 D)35

Answer 1

f(5) means to replace x in the equation with 5 then solve.

f(x) = x^2 +2x

f(5) = 5^2 + 2(5)

f(5) = 25 +10

f(5) = 35

The answer is D)35