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5y^2-80

Guest Mar 9, 2017
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factoring 5y^2-80

$$\begin{array}{|rcll|} \hline && 5y^2-80 \\ &=& 5y^2-4^2\cdot 5 \\ &=& 5\cdot(y^2-4^2) \\ &=& 5\cdot(y-4)\cdot (y+4) \\ \hline \end{array}$$

heureka  Mar 9, 2017

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