Question

решите уравнение: -Х2-10Х-23=0

Answer 1

- x^2 - 10x - 23 = 0   //: (-1)
x^2 + 10x + 23 = 0 
D = 100 - 4*23 = 8
√D = 2√2
x1 = ( - 10 + 2√2)/2 = - 5 + √2
x1 = ( - 10 - 2√2)/2 = - 5 - √2

Answer 2

$\ - x^{2} - 10 x - 23 = 0 | *(-1) \ \ x^{2} +10x+23=0 \ \ D=(10)^{2}-4*23=100 - 92 = 8 \ \ sqrt{8} =2 sqrt{2} \ \ x_{1}= frac{-10-2 sqrt{2}}{2} =-5 + sqrt{2} \ \ x_{2}= frac{-10+2 sqrt{2}}{2} =-5 - sqrt{2}$