Impara online a risolvere i problemi di passo dopo passo. Solve the inequality 7x^2+21x+-2<0. Applicare la formula: ax^2+bx+c=a\left(x^2+\frac{b}{a}x+\frac{c}{a}\right), dove a=7, b=21 e c=-2. Applicare la formula: a\left(x^2+b+c\right)=a\left(x^2+b+c+\left(\frac{coef\left(b\right)}{2}\right)^2-\left(\frac{coef\left(b\right)}{2}\right)^2\right), dove a=7, b=3x e c=-\frac{2}{7}. Applicare la formula: a\left(x^2+b+c+f+g\right)=a\left(\left(x+\sqrt{f}sign\left(b\right)\right)^2+c+g\right), dove a=7, b=3x, c=-\frac{2}{7}, x^2+b=x^2+3x-\frac{2}{7}+\frac{9}{4}-\frac{9}{4}, f=\frac{9}{4} e g=-\frac{9}{4}. Applicare la formula: ax<b=x<\frac{b}{a}, dove a=7, b=0 e x=\left(x+\frac{3}{2}\right)^2-\frac{2}{7}-\frac{9}{4}.

Solve the inequality 7x^2+21x+-2<0