Question

Find the slope of the tangent line to the graph of f at the given point.

f(x) = x2 + 5x at (4, 36)

Answer 1

\[f(x) = x^2 + 5x\\f(x)'=2x+5\]
The slope is:
\[f(4)'=2(4)+5=13\]

I'm sure you will find the tangent line c:

Answer 2

Thank You, now I understand.