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Whis is the factored from of the following expression x^2-4xy-21y^2

Whis is the factored from of the following expression x^2-4xy-21y^2
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Whis is the factored from of the following expression x^2-4xy-21y^2

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User Kush Patel
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x^2-4xy-21y^2 = (x + 3y)(x - 7y)
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User Bibo
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