The equation is x 2 -12 = 28
First of all, thanks for using superscript; it makes it easier to read:)
So this is a simple equation; first move the -12 to the other side to isolate x 2.
x 2 = 28+12
x 2 = 40
take the square root of both sides.
x= + or - sqrt(40)
This is b/c square roots have two roots, a positive and a negative one.
Now try simplifying the square root of 40.
+5478 
