Impara online a risolvere i problemi di passo dopo passo. Solve the equation y^2-4y=cos(3a). 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=-4y, x=y, x^2+bx=y^2-4y e x^2=y^2. Applicare la formula: x^2+bx+f+g=\left(x+\sqrt{f}sign\left(b\right)\right)^2+g, dove b=-4, bx=-4y, f=4, g=-4, x=y, x^2+bx=y^2-4y+4-4 e x^2=y^2. Applicare la formula: x+a=b\to x=b-a, dove a=-4, b=\cos\left(3a\right), x+a=b=\left(y-2\right)^2-4=\cos\left(3a\right), x=\left(y-2\right)^2 e x+a=\left(y-2\right)^2-4. Applicare la formula: x^a=b\to \left(x^a\right)^{\frac{1}{a}}=\pm b^{\frac{1}{a}}, dove a=2, b=\cos\left(3a\right)+4 e x=y-2.

Solve the equation y^2-4y=cos(3a)