Question

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

f(x) = x2 + 5x at (4, 36)

Question 20 options: 9

13 3 21

Answer 1

slope = 13

the slope of the tangent is f'( 4)

given f(x) = x² + 5x , then f'(x) = 2x + 5

and f'(4) = ( 2 × 4 ) + 5 = 13