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Expansion of (a ± b ± c)²

10x+y10x-y=

Question

$(10 x + y) (10 x - y) =$

A

10 x^{2} - y^{2}

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B

100 x^{2} - y^{2}

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C

99 x^{2} - y^{2}

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D

99 x^{2} + y^{2}

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Solution

The correct option is B $100 x^{2} - y^{2}$
$(10 x + y) (10 x - y) = (10 x)^{2} - y^{2}$
$= 100 x^{2} - y^{2}$

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