Answer
M = (0,0)
Work Step by Step
(-a,-b) and (a,b)
Using theorem 10.1.2 Midpoint formula
M = ($x_{m}, y_{m}) $ = ($\frac{x1+x2}{2}$, $\frac{y1+y2}{2}$)
M = ($\frac{-a+a}{2}$, $\frac{-b+b}{2}$) = (0,0)
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