Question

$3 x^{2} +x-30=0$ помогите пожалуйста

Answer 1

$d = {1}^{2} - 4 times ( - 30) times 3 = sqrt{361} = 19 \ x1 = - 1 - 19 div 2 = - 10 \ x2 = - 1 + 19 div 2 = 9$