Question

factor
4x^2 - 64y^2
i tried this on y own and ended up with 4x^2-16x+4x-16
obviously its wrong so I need someone to just solve it with the steps so i can see what im doing wrong

Answer 1

Notice that -64y^2 has the variable "y" so you need to include it in your factorization

First you take out the common factor "4"
4(x^2-16y^2)
x^2-16y^2 can be simplified as (x-4y) (x+4y)
So the answer would be
4 (x-4y) (x+4y)