Question

Решите уравнение
2x^2-5x-7=0

Answer 1

D = 5^2 - 4 * 2 * (-7) = 25 + 56 = 81
✓D = 9
x1 = (5+9)/4= 7/2= 3 1/2
x2= (5-9)/4 = -1