Question

X^2y^2 +1- x^2 - y
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Answer 1

${x}^{2} {y}^{2} + 1 - {x}^{2} - y = ( {x}^{2} {y}^{2} - {x}^{2} ) + (1 - y) = {x}^{2} ( {y}^{2} - 1) - (y - 1) = {x}^{2} (y - 1)(y + 1) - (y - 1) = (y - 1)( {x}^{2} (y + 1) - 1) = (y - 1)( {x}^{2} y + {x}^{2} - 1)$