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Question

Resolve each of the following quadratic trinomial into factor:
7x2 − 19x − 6

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Solution

The given expression is 7x2-19x-6. (Coefficient of x2=7, coefficient of x=-19 and constant term=-6)We will split the coefficient of x into two parts such that their sum is -19 and their product equals the product of the coefficient of x2 and the constant term, i.e., 7×(-6)=-42.Now, (-21)+2=-19 and (-21)×2=-42Replacing the middle term -19x by -21x+2x, we have:7x2-19x-6=7x2-21x+2x-6 =(7x2-21x)+(2x-6) =7x(x-3)+2(x-3) =(7x+2)(x-3)

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