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Bonjour
D = (1+7x)(1-7x) = 1 -49x²
E = (3x-8)² = 9x² -48x +64
F = (10y +3)(10y -3 ) = 100y² -9
D = (1+7x)(1-7x) = 1 -49x²
E = (3x-8)² = 9x² -48x +64
F = (10y +3)(10y -3 ) = 100y² -9