samantharobinso1 samantharobinso1

26-04-2019
Mathematics

contestada

HELP ASAP PLEASE!!!!

If f(x)= x^2 and g(x)= 2x+3, what is f (g(x))?

A. 4x^2+9

B. x^2+2x+3

C. 2x^2+3

D. 4x^2+12x+9

Respuesta :

jimrgrant1 jimrgrant1

26-04-2019

Answer:

D

Step-by-step explanation:

Substitute x = g(x) into f(x)

f(2x + 3) = (2x + 3)² ← expand factors

f(g(x)) = (2x)² + 6x + 6x + 3² = 4x² + 12x + 9 → D

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