Question

Factorise: 9x^2-6xy-y^2​

Answer 1

Step-by-step explanation:

(3x - y)².

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Answer 2

$9 {x}^{2} - 6xy - {y}^{2} \\ it \: can \: be \: written \: as \\ {(3x)}^{2} - 2(3x)(y) - {(y)}^{2} \\ as \: we \: know \: \\ { {(a - b)}^{2} = {a}^{2} - 2ab - {b}^{2} } \\ so \: we \: take \: \: a = 3x \: \: b = y \: \\ 9 {x}^{2} - 6xy - {y}^{2} = {(3x - y)}^{2}$

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