1 Answer

Seb Jachec · Answer 1 · 2021-06-21T19:13:32+0000

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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