Question

Expand and simplify (x+7)(x-7)

Answer 1

(x + 7)(x - 7)
x² - 7x + 7x - 49
x² - 49

Answer 2

7(x+7)(x-7) is in the form (a+b)(a-b) so it's equal to
`a^(2)- b^(2)`
Which give us:
(x+7)(x-7) =
`x^(2) - 49`

Hope this Helps :)