Roots of Quadratic

Algebra Level pending

Consider real numbers \(m\) and \(n\) such that \(-1+2i\) is a root of the quadratic equation \(x^2+mx+n=0\). If \(m\) and \(n\) are the two roots of the quadratic equation \(x^2+Ax+B=0\), what is the value of \(B-A\)?

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