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Sagot :

Bonsoir,

a.

B = -5 × 2 + 2x - 1 = (-5×2) + 2x - 1

Si x=2 alors B = (-5×2) + (2×2) - 1 = -10 + 4 - 1 = 4 - 11 = -7

Si x=5 alors B = (-5×2) + (2×5) - 1 = -10 +10 -1 = -1

b.

On remarque que plus x est grand, plus B(x) augmente.

Bonne soirée

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