Question

algebra
review passage
determine the amplitude of the following
trigonometric function.
question
$f(x) = -4 - 5\cos(2x - \pi)$
select a single answer
$a = 5$
$a = 2$
$a = -4$
$a = -\pi$

Explanation:

Step1: Recall amplitude formula

For $f(x)=C+A\cos(Bx-D)$, amplitude is $|A|$.

Step2: Identify $A$ in given function

Given $f(x)=-4-5\cos(2x-\pi)$, so $A=-5$.

Step3: Calculate absolute value

Amplitude = $|-5| = 5$

Answer:

A. $A = 5$