Решить уравнение: 3x² + 8x - 3 = 0 2x² + 9x - 32 = 0 x² - 6x - 40 = 0

1). 3 x² + 8 x - 3 = 0;

D = 64 + 36 = 100;

x = ( - 8 ± √100) : 6;

x = ( - 8 + 10) : 6; x = 1/3;

x' = ( - 8 - 10) : 6; x' = - 3;

2). 2 x² + 9 x - 32 = 0;

D = 81 + 256 = 337;

x = ( - 9 ± √337) : 4;

x ≈ ( - 9 + 18,4) : 4; x ≈ 9,35;

x' ≈ ( - 9 - 18,4) : 4; x' ≈ - 6,85;

3). x² - 6 x - 40 = 0;

D = 36 + 160 = 196;

x = (6 ± √196) : 2;

x = (6 + 14) : 2; x = 10;

x' = (6 - 14) : 2; x' = - 4.