Question

Find the product of (k – 9)2 using the perfect square trinomial rule shown on the left.

Answer 1

2k - 18 is the answer. Whenever there's something (I.e. A number or variable) attached to a parenthesis, it means you need to multiply everything inside that parentheses to get the product

Answer 2

(k-9)²
=(k-9)(k-9)
=k(k)-9(k)-9(k)-9(-9)
=k²-9k-9k+81
=k²-18k+81. As a result, the product of (k – 9)2 using the perfect square trinomial rule shown on the left is k²-18k+81. Hope it help!