Question

How do you factor `25u²-49`?

Answer 1

The factorised form is
`color(blue)((5u-7)(5u+7)`

Explanation:

`25u^2 -49`

The expression can be written as
`(5u)^2 -7^2`

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

Applying the same:
`(5u)^2 -7^2 = color(blue)((5u-7)(5u+7)`