Suppose that f is a function given as f (x) = 1 2z+5 Simplify the expression f(I + h). f ( It h) = Simplify the difference quotient, f(Ith) - f(I) h f(z + h) - f(I) h The derivative of the function at x is the limit of the difference quotient as h approaches zero. f'(x) =lim f( It h) - f(I) h-+0 h