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x^{2}-11=y
Swap sides so that all variable terms are on the left hand side.
x^{2}=y+11
Add 11 to both sides.
x=\sqrt{y+11} x=-\sqrt{y+11}
Take the square root of both sides of the equation.
x^{2}-11=y
Swap sides so that all variable terms are on the left hand side.
x^{2}-11-y=0
Subtract y from both sides.
x^{2}-y-11=0
Quadratic equations like this one, with an x^{2} term but no x term, can still be solved using the quadratic formula, \frac{-b±\sqrt{b^{2}-4ac}}{2a}, once they are put in standard form: ax^{2}+bx+c=0.
x=\frac{0±\sqrt{0^{2}-4\left(-y-11\right)}}{2}
This equation is in standard form: ax^{2}+bx+c=0. Substitute 1 for a, 0 for b, and -11-y for c in the quadratic formula, \frac{-b±\sqrt{b^{2}-4ac}}{2a}.
x=\frac{0±\sqrt{-4\left(-y-11\right)}}{2}
Square 0.
x=\frac{0±\sqrt{4y+44}}{2}
Multiply -4 times -11-y.
x=\frac{0±2\sqrt{y+11}}{2}
Take the square root of 44+4y.
x=\sqrt{y+11}
Now solve the equation x=\frac{0±2\sqrt{y+11}}{2} when ± is plus.
x=-\sqrt{y+11}
Now solve the equation x=\frac{0±2\sqrt{y+11}}{2} when ± is minus.
x=\sqrt{y+11} x=-\sqrt{y+11}
The equation is now solved.