Answer:
side b= 11.489
Step-by-step explanation:
well I'm doing the exact same lesson currently and I just did the test on this exact question soo yeahh
The area of a trapezoid can be found with the formula where b1 and b2 are the bases and h is the height. Let's plug in the values that we know and solve for h.
Given:
The function is

The binomial
is a factor of f(x).
To find:
The value of
.
Solution:
If
is a factor of f(x), then
.
It is given that,
is a factor of f(x), then
.
We have,

Substituting x=4, we get




Now,





Therefore, the value of a is 5.