tu fais
(7x - 4) 2
=(7x - 4) (7x - 4)
=7x X 7x + 7x X (-4) + (-4) X 7x + (-4) X (-4)
=49x carré - 28x - 28x - 8
49x carré - x - 8
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tu fais
(7x - 4) 2
=(7x - 4) (7x - 4)
=7x X 7x + 7x X (-4) + (-4) X 7x + (-4) X (-4)
=49x carré - 28x - 28x - 8
49x carré - x - 8