Question

use suitable identities to find the following products
1. (x+8) (x-10)
2. (3x+4)(3x-5)
3. (3-2x)(3+2x)​

Answer 1

(I) x2 + (8-10) + (8) (-10)

x2 - 2x - 80

(ii). (3x)2 + (4-5) 3x + (4) (-5)

9x2 - 3x - 20

(iii). (3)2 - (2x)2 = 9 - 4x2