Impara online a risolvere i problemi di passo dopo passo. Solve the quadratic equation s^2+7s=-20. Applicare la formula: x^2+bx=x^2+bx+\left(\frac{b}{2}\right)^2-\left(\frac{b}{2}\right)^2, dove b=7, bx=7s, x=s, x^2+bx=s^2+7s e x^2=s^2. Applicare la formula: x^2+bx+f+g=\left(x+\sqrt{f}sign\left(b\right)\right)^2+g, dove b=7, bx=7s, f=\frac{49}{4}, g=- \frac{49}{4}, x=s, x^2+bx=s^2+7s+\frac{49}{4}- \frac{49}{4} e x^2=s^2. Applicare la formula: \frac{a}{b}c=\frac{ca}{b}, dove a=49, b=4, c=-1, a/b=\frac{49}{4} e ca/b=- \frac{49}{4}. Applicare la formula: x+a=b\to x+a-a=b-a, dove a=-\frac{49}{4}, b=-20, x+a=b=\left(s+\frac{7}{2}\right)^2-\frac{49}{4}=-20, x=\left(s+\frac{7}{2}\right)^2 e x+a=\left(s+\frac{7}{2}\right)^2-\frac{49}{4}.