Question

Simplify the following:
1
(i) 2x2 - 4x +5 -
(x2 - 5x + 7)
3
(ii) (x2 - 4x - 1 - (2x2 - 5x - 2)2 – (6x2 – 2x + 1)
(ii) (3 v 2-3y-1)-Gv - -*y-3) -Gv 2 - -
1,2. 1. 2​

Answer 1

1. (i) 2x² - 4x + 5 -  (x² - 5x + 7) 3

= 2x² - 4x + 5 - x² + 5x - 7 × 3

= 2x² - 4x + 5 - x² + 5x - 21

= x² + x - 16

(ii) (x² - 4x - 1) - (2x² - 5x - 2)2 – (6x² – 2x + 1)

= x² - 4x - 1 - 2x² + 5x + 2 × 2 - 6x² + 2x - 1

= x² - 4x - 1 - 2x² + 5x + 4 - 6x² + 2x - 1

= -7x² + 3x + 2