Factorise 3x^2-5xy-12y^2
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Answer: (3x + 4y)(x - 3y)
Step-by-step explanation: 3x^2 - 5xy - 12y^2
⇒ 3x^2 - 9xy + 4xy - 12y^2
⇒ 3x(x - 3y) +4y(x - 3y)
⇒ (3x + 4y)(x - 3y)
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