\( x^{2}+5xy-36y \)
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The expression \( x^{2}+5xy-36y \) can be factored by grouping. You can look for two numbers that multiply to \(-36y\) (the constant term) and add up to \(5y\) (the coefficient of \(xy\)). These numbers are \(9y\) and \(-4y\). Thus, you can rewrite the expression as \( x^2 + 9xy - 4xy - 36y \) and group it as \((x^2 + 9xy) + (-4xy - 36y)\). Factoring out common terms will lead you to \((x + 9y)(x - 4y)\). If you're ever stumped, remember that looking for factors of the constant that can be related to the coefficient can work wonders! A common mistake is forgetting to account for each term properly when grouping or overlooking negative signs, so double-check your addition and multiplication!