Answer :
Its probably easier to explain by doing an example.
Make a the subject of the formula
b^2 = 2as + c
subtract c from both sides:-
b^2 - c = 2as
Now divide both sides by 2s ( to isolate a):-
a = (b^2 - c) / 2s
Make a the subject of the formula
b^2 = 2as + c
subtract c from both sides:-
b^2 - c = 2as
Now divide both sides by 2s ( to isolate a):-
a = (b^2 - c) / 2s