Free SAT Practice Question

Question 1 of 1
ID: SAT-PTAM-6
Section: Math - Passport to Advanced Math
Topics: Functions; Compound function
Difficulty level: Challenging

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$f\left(x\right)=\dfrac{4x - k}{2}$ and $g\left(x\right)=4x-1$. If $f\left(g\left(x\right)\right)=8x$, what is the value of $k$? (without calculator)

A$-4$
B$0$
C$2$
D$4$
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