Factorise the Following: X2y2 + 15xy - 16 - Mathematics

Factorise the following:
x²y² + 15xy - 16

Sum

x²y² + 15xy - 16
= x²y² + 16xy - xy - 16
= xy(xy + 16) - 1(xy + 16)
= (xy + 16)(xy - 1).

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