SAT Math Practice Question #14288 - SATify | SATify

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SAT Math Practice Question #14288 - SATify | SATify

#14288

functions

expressions

medium

180 sec

Functions $f (x) = x^{2} + b x$ and $g (x) = 4 x^{2} + 8 x$ are given, where $b$ is a constant. If $f (x) \cdot g (x) = 4 x^{4} + 28 x^{3} + 40 x^{2}$ , what is the value of $b$ ?

A.

$2$

B.

$5$

C.

$10$

D.

$3.5$