Question

equação de segundo Grau 
x²+10x+18=0

Answer 1

10²-4.1.18
100- 72
delta= 28

Answer 2

Baskara + Delta = $x^{2} +10x + 18=0 => x= \frac{-10+- \sqrt{ 10^{2}-4*1*18 }}{2*1} => \\ x_{1} = \frac{-10+ \sqrt{28} }{2} = \frac{-10+2 \sqrt{7} }{2} = -5+ \sqrt{7} \\ x_{2} = \frac{10+ \sqrt{28} }{2} = \frac{10+2 \sqrt{7} }{2} = 5+ \sqrt{7} :.$