Question

Найдите корни уравнения 2x^2-5x-7=0

Answer 1

$2 x^{2} -5x-7=0$
D=25+56=81
x1=3.5
x2= - 1

Answer 2

2x²-5x-7=0
D=25-4·2·(-7)=81
x₁=(5+9):4=3,5
x₂=(5-9):4=-1