Solve for x
x=40
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841-21^{2}=10x
Calculate 29 to the power of 2 and get 841.
841-441=10x
Calculate 21 to the power of 2 and get 441.
400=10x
Subtract 441 from 841 to get 400.
10x=400
Swap sides so that all variable terms are on the left hand side.
x=\frac{400}{10}
Divide both sides by 10.
x=40
Divide 400 by 10 to get 40.
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