Impara online a risolvere i problemi di equazioni quadratiche passo dopo passo. Solve the quadratic equation 4r^2+20r+25=0. Applicare la formula: ax^2+bx+c=0\to x=\frac{-b\pm \sqrt{b^2-4ac}}{2a}, dove a=4, x^2a=4r^2, b=20, x^2a+bx=0=4r^2+20r+25=0, c=25, bx=20r, x=r, x^2a+bx=4r^2+20r+25 e x^2=r^2. Applicare la formula: a=b\to a=b, dove a=r e b=\frac{-20\pm \sqrt{20^2-4\cdot 4\cdot 25}}{2\cdot 4}. Applicare la formula: x=\frac{b\pm c}{f}\to x=\frac{b+c}{f},\:x=\frac{b-c}{f}, dove b=-20, c=0, f=8 e x=r. Applicare la formula: a+b=a+b, dove a=0, b=-20 e a+b=-20+0.

Solve the quadratic equation 4r^2+20r+25=0