Question

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

Answer 1

This is known as the difference of two squares

Explanation:

Referring to the difference of two squares

`x^2-16y^2`
`= x^2 - (4y)^2`
`= (x-4y)(x+4y)`

From the answer,
You can see that
`a= X`
`b= 4y`