(32 + 2x) * (24 + 2x) = 768 +64x + 48x + 4x²
= 4x² +112x +768
Pour x = 5 cm on trouve St = 1428 cm²
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(32 + 2x) * (24 + 2x) = 768 +64x + 48x + 4x²
= 4x² +112x +768
Pour x = 5 cm on trouve St = 1428 cm²