<img src="https://tex.z-dn.net/?f=%28x%20-%207%29%28y%20-%209%29" id="TexFormula1" title="(x - 7)(y - 9)" alt="(x - 7)(y

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mario62 [17]

3 years ago

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Mathematics

1 answer:

Snezhnost [94]3 years ago

4 0

Remark

There are occasions where this is very handy to know. Use FOIL.

Solve

F: (First): x*y = xy

O: (Outside): x *(-9) = - 9x

I:(Inside): (-7)*y = - 7y

L:(Last): (-7)*(-9) = 63

Add the terms together

xy - 9x - 7y + 63 <<<< Answer

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