bonjour
2 a + 2 b = 48
donc a + b = 24
ab = 135
a + b = 24 ⇔ a = 24 - b
( 24 - b ) b = 135
- b² + 24 b - 135 = 0
Δ = 576 - 4 ( - 1 * - 135 ) = 576 - 540 = 36 = 6 ²
x 1 = ( - 24 - 6 ) / - 2 = - 30 / - 2 = 15
x 2 = ( - 24 + 6 ) / - 2 = - 18 / - 2 = 9
dimensions = 15 m sur 9
