bonsoir
5x + (2x - 3) = 5 x + 2 x - 3 = 7 x - 3
3x2 - (4x2 – x+5) = 3 x² - 4 x² + x - 5 = - x² + x - 5
6x2 + 2x - x + 5 - 4x2 = 2 x² + x + 5
5(2x + 6) = 10 x + 30
3x + 2(x - 5) = 3 x + 2 x - 10 = 5 x - 10
-2x(3x + 5) = - 6 x² - 10 x
-3x(6 - 5x) = - 18 x + 15 x²
18x + 24x2 = 6x ( 3 + 8 x )
