bonsoir
a) AD = x + 3 + x - 2 = 2 x + 1
b) aire ABCD = ( 2 x + 1 ) ² = 4 x² + 4 x + 1
c) aire ABEF = ( x + 3) ( 2 x + 1 ) = 2 x² + x + 6 x + 3 = 2 x² + 7 x + 3
d) aire ECDF = ( x - 2 ) ( 2 x + 1 ) = 2 x² + x - 4 x - 2 = 2 x² - 3 x - 2
2 x² + 7 x + 3 + 2 x² - 3 x - 2 = 4 x² + 4 x + 1
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bonsoir
a) AD = x + 3 + x - 2 = 2 x + 1
b) aire ABCD = ( 2 x + 1 ) ² = 4 x² + 4 x + 1
c) aire ABEF = ( x + 3) ( 2 x + 1 ) = 2 x² + x + 6 x + 3 = 2 x² + 7 x + 3
d) aire ECDF = ( x - 2 ) ( 2 x + 1 ) = 2 x² + x - 4 x - 2 = 2 x² - 3 x - 2
2 x² + 7 x + 3 + 2 x² - 3 x - 2 = 4 x² + 4 x + 1