Solve for A
A=8
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40401-199^{2}=100A
Calculate 201 to the power of 2 and get 40401.
40401-39601=100A
Calculate 199 to the power of 2 and get 39601.
800=100A
Subtract 39601 from 40401 to get 800.
100A=800
Swap sides so that all variable terms are on the left hand side.
A=\frac{800}{100}
Divide both sides by 100.
A=8
Divide 800 by 100 to get 8.
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