f(x) = 5x^2-7x+2
f '(x) = (5x^2-7x+2)' = (5x^2)'-(7x)'+2' = 5*(x^2)'-7*x'+0 = 5*2x^(2-1)-7*1 = 10x^1-7 = 10x-7
f(x) = 5x^2-7x+2
f '(x) = (5x^2-7x+2)' = (5x^2)'-(7x)'+2' = 5*(x^2)'-7*x'+0 = 5*2x^(2-1)-7*1 = 10x^1-7 = 10x-7