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Question

Resolve each of the following quadratic trinomial into factor:
12x2 − 17xy + 6y2

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Solution

The given expression is 12x2-17xy+6y2. (Coefficient of x2=12, coefficient of x=-17y and constant term=6y2)We willsplit the coefficient of x into two parts such that their sum is -17y and their product equals the product of the coefficient of x2 and the constant term i.e., 12×6y2=72y2.Now, (-9y)+(-8y)=-17y and (-9y)×(-8y)=72y2Replacing the middle term -17xy by -9xy-8xy, we get:12x2-17xy+6y2=12x2-9xy-8xy+6y2 =(12x2-9xy)-(8xy-6y2) =3x(4x-3y)-2y(4x-3y) =(3x-2y)(4x-3y)

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