f(x)=(x+2)^2-2x+2=&gt;f(x)=(x+2)^2-2(x+2)+4+2 =&gt;\\&amp;#10;f(x)=(x+2)^2-2(x+2)+6 =&gt;\\&amp;#10;f(\alpha)=\alpha^2-2\alpha+6