Question

What quadratic formula do I need to use to solve 3x(x+6)=-1

Answer 1

`\Large \boxed{x_1=(9+√(51) )/(3) \ \ ; \ \ x_2=(9-√(51) )/(3) }`

Explanation:

`\displaystyle \Large \boldsymbol{} 3x(x+6)=-10 \\\\3x^2+18x=-10 \\\\3x^2+18x+10=0 \\\\D=324-120=204 \\\\ x_(1;2)=(18\pm2√(51) )/(6) =(9\pm√(51) )/(3)`