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Expand $-(3-c)(c+2(3-c))$. 

 Oct 28, 2020
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Hello Guest!

 

\({\color{BrickRed}-(3-c)(c+2(3-c))} \\ =(c-3)(c+6-2c)\\ =c^2+6c-2c^2-3c-18+6c\)

 

\(-(3-c)(c+2(3-c))=-c^2+9c-18 \)

laugh  !

 Oct 28, 2020
edited by asinus  Oct 28, 2020

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