Question

If a=x+y and b=x-y ,show that (a-b)^2=4y^2​

Answer 1

Explanation:

`((x + y) - (x - y) ){}^(2) = 4 {y}^(2)`

`(2y) {}^(2) = 4 {y}^(2)`

`{2}^(2) {y}^(2) = {4y}^(2)`

`4 {y}^(2) = 4 {y}^(2)`