bonjour
A = - x² + 4 ( 5 - x )
= x² + 20 - 4 x
x = 3 ⇔ A = - ( 3)² + 20 - 4 *3 = 9 + 20 - 12 = 17
x = - 4 ⇔ A = - ( - 4)² + 20 - 4 * -4 = - 16 + 20 + 16 = 20
x = - 2.8 ⇔ A = - ( - 2.8)² + 20 - 4 * - 2.8 = - 7.84 + 20 + 11.2 = 23.36
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bonjour
A = - x² + 4 ( 5 - x )
= x² + 20 - 4 x
x = 3 ⇔ A = - ( 3)² + 20 - 4 *3 = 9 + 20 - 12 = 17
x = - 4 ⇔ A = - ( - 4)² + 20 - 4 * -4 = - 16 + 20 + 16 = 20
x = - 2.8 ⇔ A = - ( - 2.8)² + 20 - 4 * - 2.8 = - 7.84 + 20 + 11.2 = 23.36