Impara online a risolvere i problemi di passo dopo passo. Solve the quadratic equation r^2-4r=30. Applicare la formula: x^2+bx=x^2+bx+\left(\frac{b}{2}\right)^2-\left(\frac{b}{2}\right)^2, dove b=-4, bx=-4r, x=r, x^2+bx=r^2-4r e x^2=r^2. Applicare la formula: x^2+bx+f+g=\left(x+\sqrt{f}sign\left(b\right)\right)^2+g, dove b=-4, bx=-4r, f=4, g=-4, x=r, x^2+bx=r^2-4r+4-4 e x^2=r^2. Applicare la formula: x+a=b\to x+a-a=b-a, dove a=-4, b=30, x+a=b=\left(r-2\right)^2-4=30, x=\left(r-2\right)^2 e x+a=\left(r-2\right)^2-4. Applicare la formula: x+a+c=b+f\to x=b-a, dove a=-4, b=30, c=4, f=4 e x=\left(r-2\right)^2.

Solve the quadratic equation r^2-4r=30