What do I do to rearrange the formula y=a-bx^2 to make x the subject?

Question

Rearrange the formula y=a-bx^2 to make x the subject

Answer 1

y=a -bx^2

-bx^2 = y-a

bx^2 = a-y

x^2 = (a-y)/b

x = + or - sqr[(a-y)/b]