I understand that these equations are equivalent but I do not understand how. Please show me how you manipulate the original equation to get the other equations. Help Thanks.

Original Equation:$\displaystyle x^4-13x^2+36=0$

$\displaystyle (2x^2)-2(2x^2)13+144=0$

$\displaystyle (2x^2)^2-2(2x^2)13+169=25$