Question

x2 - 11×-42 factorise​

Answer 1

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Answer 2

As we can see the cofficient of x is 1 and the constant value is -42

Now 1×-42=-42

So we beed to devide the coefficient of x in such a way so that it multiplies to be -42 and adds up to be 11

1. x^2-11x-42
2. x^2-14x+3x-42
3. x(x-14)+3(x-14)
4. (x-14)(x+3)

Further more its roots are 14 and -3

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