bonjour
A(x)=A(EFG)-A(EPR)
=(EG×EF)/2-(EP×ER)/2
=(12×5)/2-(x(12-2x))/2
=30-(12x-2x²)/2
=30-6x+x²
A(x)=x²-6x+30
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bonjour
A(x)=A(EFG)-A(EPR)
=(EG×EF)/2-(EP×ER)/2
=(12×5)/2-(x(12-2x))/2
=30-(12x-2x²)/2
=30-6x+x²
A(x)=x²-6x+30