Question

Simplify (y + 9)(y - 9).
А у2
B у2 - 18
C y2 - 81
D у2 + 81

Answer 1

Answer is y^2-81

Explanation:

Answer 2

C

Explanation:

According to formula

(a+b)(a-b)=a²-b²

So

(y+9)(y-9)

=y²-(9)²

=y²-81