Solve for x
x=8
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\sqrt{x+56}+12-12=20-12
Subtract 12 from both sides of the equation.
\sqrt{x+56}=20-12
Subtracting 12 from itself leaves 0.
\sqrt{x+56}=8
Subtract 12 from 20.
x+56=64
Square both sides of the equation.
x+56-56=64-56
Subtract 56 from both sides of the equation.
x=64-56
Subtracting 56 from itself leaves 0.
x=8
Subtract 56 from 64.
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