Find the critical numbers of the function. 29. f(x) = 3x² + x 2 31. f(x) = 3x4 + 8x³ - 48x² 3 33. g(t) = t³ + 5t³ + 50t y-1 35. g(y) = y² = y + 1 x² + 2 2 37. p(x) 2x - 1 39. h(t) = t³ 3"