Question

Use a suitable identity to get each of the following products
(3a - 1\2) (3a- 1/2)

Answer 1

(3a−12)(3a−12)=(3a−12)2
=(3a)2−2×3a×12+(12)2[Usingidentity(a−b)2=a2−2ab+b2]
=9a2−3a+14