factorise using (x+a)(x+b)=x2+(a+b)x+ab: x2-11x-42
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Step-by-step explanation:
x2-14x+3x-42 (by expanding -11x as -14x+3x)
=x(x-14)+3x(x-14)
=(x-14)(x+3x)
Hope this will help you..
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