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Question

Factorize each of the following algebraic expression:
x2 − 22x + 120

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Solution

To factorise x2-22x+120, we will find two numbers p and q such that p+q=-22 and pq=120.Now, (-12)+(-10)=-22 and (-12)×(-10)=120Splitting the middle term -22x in the given quadratic as -12x-10x, we get:x2-22x+12=x2-12x-10x+120 =(x2-12x)+(-10x+120) =x(x-12)-10(x-12) =(x-10)(x-12)

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