Bonsoir,
3(2x - 5) = 5 - (3x - 7)
6x - 15 = 5 - 3x + 7
6x - 15 = 12 - 3x
6x + 3x = 12 + 15
9x = 27
x = 3
-3(2x - 4) = 5x + 3√7
-6x + 12 = 5x + 3√7
-6x - 5x = 3√7
-11x = 3√7 - 12
x = 3√7 / 11 + 12/11
x ≈ 0.36
(-4x - 3)(4 + 7x) + (2x - 3)(x + 4) = 0
-16x - 28x² - 12 - 21x + 2x² + 8x - 3x - 12 = 0
-32x - 26x² - 24 = 0
-26x² - 32x - 24 = 0
-2(13x² + 16x + 12) = 0
13x² + 16x + 12 = 0
x = [tex] \frac{-16+ \sqrt{16^2-4*13*12} }{2*13} [/tex]
x = [tex] \frac{-16+ \sqrt{256-624} }{26} [/tex]
x = [tex] \frac{-16+ \sqrt{-368} }{26} [/tex]
x ∉ R
Je vous laisse la suite.
