Question

х^2 – 3xy — 40у^2 plz tell
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Answer 1

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$= {x}^{2} - 3xy - 40 {y}^{2} \\ = {x}^{2} - (8 - 5)xy - 40 {y}^{2} \\ = {x}^{2} - 8xy + 5xy - 40 {y}^{2} \\ = x(x - 8y) + 5y(x - 8y) \\ = (x - 8y)(x + 5y) \\ - > \: \: x = 8y \: \\ - > \: \: x = - 5y$