find an equation of the normal line to the parabola y=x^2-8x+9 at point (3,-6)... help me..

find an equation of the normal line to the parabola y=x^2-8x+9 at point (3,-6)... help me..

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Can you use calculus?

how to use it? i don't know coz it do not give the value of x after differetiate.. so i don't know how to find m..

What do you get for y'(x) in general?

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