There are many type of solving Quadratic Equations, it can be SQUARE ROOTS,FACTORING,COMPLETING A SQUARE and QUADRATIC FORMULA, but there is basic way of solving Quadratic Equations.
there are 2 types of Quadratic Equations:
1) Standard form( ax2+bx+c=0 )
2) General Form ( ax2+bx+0 )

When solving quadratic equations your answer must be arranged depending on the given equation that is given to you.
example: ( standard form )
given equation is x-x2=7 
1) You must arranged the given equation according of the form.

Take Note that when transferring the number that is behind of the equal sign will change it sign.