Réponse :
factoriser C
C = (6 x - 10)(4 - x) - (5 - 3 x)²
= 2(3 x - 5)(4 - x) - (- 3 x + 5)²
= 2(3 x - 5)(4 - x) - (- (3 x - 5))²
= 2(3 x - 5)(4 - x) - (3 x - 5)²
= (3 x - 5)(2(4 - x) - (3 x - 5))
= (3 x - 5)(8 - 2 x - 3 x + 5)
= (3 x - 5)(13 - 5 x)
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