Hi, can anyone tell me why this is wrong? First I factor the characteristic equation and get that r is either 0 or -1: Then I plug those values into the solution for two real roots: But according to wolfram the second term is supposed to be negative. Why is that?
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Because Wolfram Alpha is stupid? Since $\displaystyle C_{2} $ can be positive or negative, it can absorb the negative.
Haha! That makes sense. Thanks
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