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factorise y to the power of 2 -y -72

Sagot :

Luanaidn
[tex]y^2-y-72=0\ \ \ | write\ -y\ as\ 8y-9y\\\\ y^2+8y-9y-72=0\\\\y(y+8)-9(y+8)=0\\\\(y-9)(y+8)=0\\\\ y=9\ or\ y=-8[/tex]
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