Question

Como resolver: (X-Y)×(Y-2X) para X=3 e y= -1/2

Answer 1

$(x - y) \times (y - 2x) \\ (3 - \frac{ - 1}{2} ) \times ( \frac{ - 1}{2} - 2 \times 3) \\ ( \frac{6 - 1}{2} ) \times ( \frac{ - 1 -12 }{2} ) \\ \frac{5}{2} \times \frac{ - 13}{2} \\ \frac{ - 65}{4} = - 16.25$