47. Solve the quadratic function: x - 9x = 0 A) 0 only B) 0 and 3 C) 0 and -3 D) 0 and 9 48. The factors of x + 3x 18 are which of the following? A) (x-3) and (x + 6) B) (x 3) and (x - 6) C) (x+3) and (x - 6) D) (x 2) and (x + 9) 49. If f(x) = -5x - 7, then what is f(-2)? A) -1 B) 0 C) 2 D) 3