The formula for (a-b) ^2 is a^2-2ab+b^2.
(x-2) ^2=x^2-2*x * (-2) + 4
=x^2+4x+4
I solved this. Why is not correct to take the second number negative? I mean, the solution for the exercise is x^2-4x+4. Why is it negative instead of positive?
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