Question

If f(x) = 2x and g(x) = 5x + 2, what is (f • g)(x) when x = 3?

Answer 1

Answer:

f×g=

$= 2x \times (5x + 2) \\ = 10 {x}^{2} + 4x \\ = 10 \times {3}^{2} + 4 \times 3 \\ = 90 + 12 \\ = 102$