Suppose that f is a function given as f(x) - V - 4x - 7. Simplify the expression f(I + h). f ( I + h) - f(z + h) - f(1) Simplify the difference quotient, h f (I t h) - f(I) h Rationalize the numerator in the difference quotient. (If applies, simplify again.) f ( z + h) - f(I) h The derivative of the function at @ is the limit of the difference quotient as h approaches zero. f'(I) - lim f (1 + h) - f(I) ho h