Question

If x-y = 40 and x+y = 70, then what is the value of x squared -y squared ?

Answer 1

Let's see what to do buddy...

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Reminder:

`(a + b)(a - b) = {a}^(2) - {b}^(2)`

So we need to just Multiply above equations like this :

`x + y = 70`

`x - y = 40`

`(x + y)(x - y) = 70 * 40`

`{x}^(2) - {y}^(2) = 2800`

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And we're done.

Thanks for watching buddy good luck.

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