Applicare la formula: $x^2+x+c$$=x^2+x+c+\frac{1}{4}-\frac{1}{4}$, dove $c=-1$ e $x=y$

Applicare la formula: $x^2+x+c+f+g$$=\left(x+\sqrt{f}\right)^2+c+g$, dove $c=-1$, $f=\frac{1}{4}$, $g=-\frac{1}{4}$, $x=y$, $x^2=y^2$ e $x^2+x=y^2+y-1+\frac{1}{4}-\frac{1}{4}$

Applicare la formula: $a^b$$=a^b$, dove $a=\frac{1}{4}$, $b=\frac{1}{2}$ e $a^b=\sqrt{\frac{1}{4}}$

Applicare la formula: $\frac{a}{b}+c$$=\frac{a+cb}{b}$, dove $a/b+c=\left(y+\frac{1}{2}\right)^2-1-\frac{1}{4}$, $a=-1$, $b=4$, $c=-1$ e $a/b=-\frac{1}{4}$

Applicare la formula: $a+b$$=a+b$, dove $a=-1$, $b=-4$ e $a+b=-1-4$