The function f is defined for all x ∈ ℝ. The line with equation y = 6x − 1 is the tangent to the graph of f at x = 4. Write down the value of f′(4).

Answer 1

f'(4) = the slope of the tangent line at x=4

f'(4) = the coefficient of the x term of the equation for the tangent line when it is solved for y

y=6x -1, the coefficient = 6

f'(x) = 6