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_*(-.5)*_= -20

 Jan 6, 2017
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\(x (-0.5) x = -20 \)

\(-0.5{x}^{2}=-20\)

\({x}^{2}=\frac{-20}{-0.5}\)

\({x}^{2}=40\)

\(x=\sqrt{40}\)

\(x= 2\sqrt{10} , x=-2\sqrt{10}\)

.
 Jan 6, 2017
edited by xvxvxv  Jan 6, 2017

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