Question

(a – b)2 = (a – b)(a – b) = a2 – 2ab + b2 Find the product of (k – 9)2 using the perfect square trinomial rule shown on the left.

Answer 1

1. (k-9)(k-9)_____or B.

2. 18__________or B.

3. 81__________or C.

Explanation:

Answer 2

(a – b)^2 = (a – b)(a – b) = a^2 – 2ab + b^2
so
(k – 9)^2 = k^2 - 18k + 81

hope it helps