Question

How do you multiply `(7q - 5)(7q + 5)`?

Answer 1

`=49q^2 -25`

Explanation:

`(7q-5) (7q+5)`

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

Applying the above property:

`7q = color(blue)(a`
`5 = color(blue)(b`

`(7q-5) (7q+5) = (7q)^2 - 5^2`

`=49q^2 -25`