Find and simplify the different quotient
f(x+h)-f(x) / h
f(x+h)-f(x) / h =???? simplify
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f(x+h)= (x+h)^2-9(x+h)+2= x^2+2xh+h^2-9x-9h+2
f(x+h)-f(x) / h = (x^2+2xh+h^2-9x-9h+2-x^2+9x-2)/h
=(2xh+h^2-9h)/h= h(h+2x-9)/h = h+2x-9
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