bonjour
(-x-4)(2x+3) - (-x-4)(5x+7) = 0
- 2 x² - 3 x - 8 x - 12 - ( - 5 x² - 7 x - 20 x - 28 ) = 0
- 2 x² - 11 x - 12 + 5 x² + 27 x + 28 = 0
3 x² + 16 x + 16 = 0
Δ = 16 ² - 4 ( 3 * 16) = 256 - 192 = 64 = 8 ²
x 1 = ( - 16 - 8 ) / 6 = - 24/6 = - 4
x 2 = ( - 16 + 8 ) / 6 = - 8 /6 = - 4/3
= 0 pour x = - 4 et - 4/3
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bonjour
(-x-4)(2x+3) - (-x-4)(5x+7) = 0
- 2 x² - 3 x - 8 x - 12 - ( - 5 x² - 7 x - 20 x - 28 ) = 0
- 2 x² - 11 x - 12 + 5 x² + 27 x + 28 = 0
3 x² + 16 x + 16 = 0
Δ = 16 ² - 4 ( 3 * 16) = 256 - 192 = 64 = 8 ²
x 1 = ( - 16 - 8 ) / 6 = - 24/6 = - 4
x 2 = ( - 16 + 8 ) / 6 = - 8 /6 = - 4/3
= 0 pour x = - 4 et - 4/3