(M+3)(M-4)=-6 Once you get to the part of the problem where it is M^2-4m+3m-12 can you explain to me why it becomes m^2-m-12 because I’d think it was m^2-7m-12

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A: Follow the procedure given below.

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A: For the given as below:

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Polynomials

Try substituting 1. You will get 6 and not 0. Try other real values also. What About -2? Let us check.