Impara online a risolvere i problemi di passo dopo passo. Solve the quadratic equation z^2+6z=-5. Applicare la formula: x^2+bx=x^2+bx+\left(\frac{b}{2}\right)^2-\left(\frac{b}{2}\right)^2, dove b=6, bx=6z, x=z, x^2+bx=z^2+6z e x^2=z^2. Applicare la formula: x^2+bx+f+g=\left(x+\sqrt{f}sign\left(b\right)\right)^2+g, dove b=6, bx=6z, f=9, g=-9, x=z, x^2+bx=z^2+6z+9-9 e x^2=z^2. Applicare la formula: x+a=b\to x+a-a=b-a, dove a=-9, b=-5, x+a=b=\left(z+3\right)^2-9=-5, x=\left(z+3\right)^2 e x+a=\left(z+3\right)^2-9. Applicare la formula: x+a+c=b+f\to x=b-a, dove a=-9, b=-5, c=9, f=9 e x=\left(z+3\right)^2.