Question

Time for a fun math question.

If
`x^2-y^2=121` and the value of
`x+y` is -11, then what is the value of
`x-y`?

Answer 1

`-11 = x - y`

Explanation:

`121 = {x}^(2) - {y}^(2) \\ \\ 121 = [x - y][x + y] \\ \\ 121 = [x - y][-11] \\ \\ -11 = x - y`

I am joyous to assist you anytime.

Answer 2

x^2 -y^2 = 121

( x-y)( x+y) = 121

-11( x-y) = 121

x- y = -11