Bonsoir,
E= (1/3 - 2x)² -4/9
= (1/3 - 2x) (1/3 -2x) -4/9
= 1/9 -2x/3 -2x/3 +4x² -4/9
= 4x² -4x/3 -3/9
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Bonsoir,
E= (1/3 - 2x)² -4/9
= (1/3 - 2x) (1/3 -2x) -4/9
= 1/9 -2x/3 -2x/3 +4x² -4/9
= 4x² -4x/3 -3/9