Slove question 5(a), 15 and 21

21. Find the coordinates of the point on the curve f (x) = 3x2 4x where the tangent is parallel to the line )2 = 8x. 1 .. A 5. Rationalize the numerator of each expression to obtain an equivalent expression. V16+h4 Vh2+5h+42 V5+ \\ . b. a h h C h 15. Determine the equation of the tangent to y = x - 3x + 1 at (3, 1)