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[tex]A = ( 3 x + 1 ){2} + ( 3 x + 1 ) ( 2 x + 5 ) \\A = 9 x^{2} + 6 x + 1 + 6 x^{2} + 15 x + 2 x + 5 \\A = 15 x^{2} + 23 x + 6 \\\\\\A = ( 3 x + 1 ) ( 3 x + 1 + 2 x + 5 ) \\A = ( 3 x + 1 ) ( 5 x + 6 ) \\\\pour x = 2/3\\\\A = ( 6/3 + 1 ) ( 10/3 + 6)\\A = ( 6/3 + 3/3 ) ( 10/3 + 18/3 )\\A = 9/3 * 28*3\\A = 252/9 = 28 \\\\\\[/tex]

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