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

Answer: 9x²-81x

Step-by-step 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

x^2 - 81

Step-by-step explanation:

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

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