Question

How can we multiply 2 equations​

Answer 1

Given equations:

1. a = x + y
2. b = x - y

To multiply 1 and 2;

`{ \tt{a * b = (x + y)(x - y)}} \\ = { \tt{(x.x) + (x. - y) + (y.x) + (y. - y)}} \\ = { \tt{ {x}^(2) - xy + xy - {y}^(2) }} \\ = { \tt{ {x}^(2) - {y}^(2) }}`