3 years ago

Mr Thomas is trying to buy a new ladder that cost $180. He has already saved $63 and he

1 answer:

8 0

Well... you never finished your sentence so I'll fill in the blank. Sorry if its wrong. And he wants to see how much money he needs left. He need 117 more dollars

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

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Let's see what to do buddy...

____________________________

Reminder:

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

So we need to just Multiply above equations like this :

$x + y = 70$

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$(x + y)(x - y) = 70 \times 40$

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And we're done.

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