SAT Math Practice Question #8006 - SATify | SATify

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SAT Math Practice Question #8006 - SATify | SATify

#8006

equations

algebra

functions

substitution

roots

quadratic equations

easy

30 sec

The function $f$ is defined by $f (x) = x^{2} + 5$ . For which value of $x$ is $f (x) = 21$ ?

A.

4

B.

6

C.

16

D.

21