Question

How do you factor `49x^2-16`?

Answer 1

`color(blue)(a^2 - b^2 = (a+b)(a-b)`

`49x^2 - 16 = (7x)^2 - (4)^2`

`(7x)^2 - (4)^2 = color(red)((7x-4)(7x+4)`