Răspuns :
2·(3-x) + 5x - 4 = 7
2·3 - 2·x + 5x - 4 = 7
3x + 2 = 7
3x = 7-2
3x = 5
x = 5/3
x² + 7x + 10 = 0
x² + 5x + 2x + 10 = 0
x(x+5) + 2(x+5) = 0
(x+2)(x+5) = 0
x+2 = 0 => x1 = -2
x+5 = 0 => x2 = -5
2·(3-x) + 5x - 4 = 7
2·3 - 2·x + 5x - 4 = 7
3x + 2 = 7
3x = 7-2
3x = 5
x = 5/3
x² + 7x + 10 = 0
x² + 5x + 2x + 10 = 0
x(x+5) + 2(x+5) = 0
(x+2)(x+5) = 0
x+2 = 0 => x1 = -2
x+5 = 0 => x2 = -5