Question

(x² + 8x + 7) (2x - x - 3) (2x + 11x – 21)​

Answer 1

Answer:

13x⁴ + 44x³ - 14x² - 732x - 945

Step-by-step explanation:

(x² + 8x + 7) (2x - x - 3) (2x + 11x - 21)

= (x² + 8x + 7) (x - 3) (13x - 21)

= (x³- 3x² + 8x² - 24 + 7x - 21) (13x - 21)

= (x³ + 5x² + 7x - 45) (13x - 21)

= (13x⁴ - 21x³ + 65x³ - 105x² + 91x² - 147x - 585x - 945)

= (13x⁴ + 44x³ - 14x² - 732x - 945)