Question

(x 2 − 3x) 2 − 8 (x 2 − 3x) − 20

Answer 1

Answer:

-12

Step-by-step explanation:

(2-3)=1,2-8=6,(2-3)=6,-20

1+6+6-20=-12

Answer 2

Step-by-step explanation:

Let x² - 3x = a & then (x² - 3x)² = a²

=> a² - 8a - 20

=> a² - 10a + 2a - 20

=> a(a - 10) + 2(a - 10)

=> (a - 10)(a + 2)

=> (x² - 3x - 10)(x² - 3x + 2)

=> (x² - 5x + 2x - 10)(x² - 2x - x + 2)

=> [x(x - 5) + 2(x - 5)] [x(x - 2) - (x - 2)]

=> [(x - 5)(x + 2)] [(x - 2)(x - 1)]

=> (x - 5)(x + 2)(x - 2)(x - 1)

Or,

=> (x - 1)(x - 2)(x + 2)(x - 5)