Решение
1) 2x² - 5x - 3 = 0
D = 25 + 4*2*3 = 49
x₁ = (5 - 7)/4
x₁ = - 1/2
x₂ = (5 + 7)/4
x₂ = 3
4) x² + 9x - 22 = 0
D = 81 + 4*1*22 = 169
x₁ = (- 9 - 13)/2
x₁ = - 11
x₂ = (- 9 + 13)/2
x₂ = 2
7) x² - 12x + 32 = 0
D = 144 - 4*1*32 = 16
x₁ = (12 - 4)/2
x₁ = 4
x₂ = (12 + 4)/2
x₂ = 8