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Question

Resolve each of the following quadratic trinomial into factor:
6x2 − 5xy − 6y2

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Solution

The given expression is 6x2-5xy-6y2. (Coefficient of x2=6, coefficient of x=-5y and constant term=-6y2)We will split the coefficient of x into two parts such that their sum is -5y and their product equals the product of the coefficient of x2 and the constant term, i.e., 6×(-6y2)=-36y2.Now, (-9y)+4y=-5y and(-9y)×4y=-36y2 Replacing the middle term -5xy by -9xy+4xy, we get:6x2-5xy-6y2= 6x2-9xy+4xy-6y2 =(6x2-9xy)+(4xy-6y2) =3x(2x-3y)+2y(2x-3y) =(3x+2y)(2x-3y)

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