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Question

Factorize each of the following algebraic expression:
x2 − 11x − 42

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Solution

To factorise x2-11x-42, we will find two numbers p and q such that p+q=-11 and pq=-42.Now,3+(-14)=-22 and 3×(-14)=42Splitting the middle term -11x in the given quadratic as-14x+3x, we get: x2-11x-42=x2-14x+3x-42 =(x2-14x)+(3x-42) =x(x-14)+3(x-14) =(x+3)(x-14)

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