B. Find the missing. factor of the following. 1. x³+3x²-6x18=(x+3) (_____) 2. x³y³-27=(xy-3) (______) 3. x³-3x²-16x+48=(x-3) (___) (___)
C. one of the roots of the polynomial equation 20x³+4x²-45x-9=0 is -1/5. Find the other roots.
D. solve the following problem. A rectange has an area of x²+14x+49. If the length is represented by x+7, what is the width of the rectangle?​