Answer
$f'(x) = -10x + 8$
Domain: All Real Numbers
Work Step by Step
$f(x) = 4 + 8x - 5x^{2}$
$f'(x) = 8x^{1-1} - (2)5x^{2-1}$
$f'(x) = -10x + 8$
Domain is all real numbers because there values of x that would make f'(x) undefined
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.