Question

Compute f '(a) algebraically for the given value of a.
f(x) = 9x^2 + x; a = 7 Explain please?

Answer 1

so bring the exponent to the base and subtract one from the exponent to get 18x+1. plugging in 7 results in 18(7)+1=127

Answer 2

f'(x) = 18x + 1
f'(a) = 126=1 = 127

Answer 3

does that count as "algebraically"? I never heard that terminology before.

Answer 4

I submitted the answer online and 127 as the form they asked for. Thank you!