Question

find the equation of the tangent line to the curve y = ln(x2 − 9x + 1), (9, 0)

Answer 1

Need help finding y'?
That is the first step.
Hint. (ln(u))'=u'/u

Answer 2

what do you after that step

Answer 3

equation of the tangent line can be found using the point-slope form for a line
y-y1=m(x-x1)
m=f'(9)

Answer 4

Your point is (9,0)