Moderate# Mean Value Theorem to Find Equation of Line

APCALC-C3SKJR

Suppose you have the function $f(x)={ x }^{ 5 }+{ x }^{ 3 }+x-3$ and a line $L(x)$ that intersects $f(x)$ when $x=1$.

What is the equation of $L(x)$ that satisfies the Mean Value Theorem for $f(x)$ on the interval $[-1,2]$?