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Sagot :

AYUDA

A = 5x - x²

B = x (5 - x)

si x = 0

alors A = 5*0  - 0² = 0

et B = 0 (5 - 0) = 0*5 = 0

si x = 2

A = 5*2 - 2² = 6

B = 2 (5-2) = 6

de meme avec x = 5

on peut conjecturer que A = B

3a)

B = x*5 + x*(-x) = 5x - x²

b)c) donc B = A

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