Question

How do you multiply `(5x - 5)(5x + 5)`?

Answer 1

`=color(blue)(25x^2 -25`

Explanation:

`color(blue)((5x−5))(5x+5)`

The expression is of the form
`color(blue)((a-b)(a+b) = a^2-b^2`

Here `a=5x , b=5`

So,
`(5x)^2 - (5)^2=color(blue)(25x^2 -25`