Question

What is the product of (x+9)(x-9)

Answer 1

Answer: 9x²-81x

Explanation:

1. Reorder the terms like this: (9x)• (x-9)

2. Remove unnecessary Parentheses like this: 9x•(x-9)

3. Distribute 9x through the Parentheses like this:

9x would become 9x² (because I combined 9x and 9x which become 9x²)

(x-9) would become -81x (so if you need further explanation I took the (x-9) and made it -9x then multiplied it by the 9x because of distributive property.)

The solution: 9x²-81x

Answer 2

x^2 - 81

Explanation:

There is a formula called the difference of squares, which is

(a+b)(a-b) = a^2 - b^2