Question

How do you factor the trinomial `49 - 4x^2`?

Answer 1

`7^2-(2x)^2=(7+2x)(7-2x)`

Explanation:

`49-4x^2` represents a difference of squares, in which `a^2-b^2=(a+b)(a-b)`, where `a=7 and b=2x`.

`7^2-(2x)^2=(7+2x)(7-2x)`