Bonjour,
(2v-4)(7v+2) = (2v*7v)+(2v*2)+(-4*7v)+(-4*2) = 14v²+4v-28v-8 = 14v²-24v-8
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Bonjour,
(2v-4)(7v+2) = (2v*7v)+(2v*2)+(-4*7v)+(-4*2) = 14v²+4v-28v-8 = 14v²-24v-8