Question

Помогите решить:
3х в квадрате -2х-5=0

Answer 1

${3x}^{2} - 2x - 5 = 0 \\ {x}^{2} - 2x - 15 = 0 \\ x1 + x2 = 2 \\ x1 \times x2 = - 15 \\ x1 = \frac{5}{3} \\ x2 = - \frac{3}{3} = - 1$

Answer 2

3x^2-2x-5=0
D= b^2-4ac= 4+60= 64
x1,= 2+8/2= 5
x2= 2-8/2= -3
x1=5
x2=-3