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100-a
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100-a
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\sqrt{100-a}\sqrt{-a+100}
Combine 2\sqrt{-a+100} and -\sqrt{-a+100} to get \sqrt{-a+100}.
\left(\sqrt{100-a}\right)^{2}
Multiply \sqrt{100-a} and \sqrt{-a+100} to get \left(\sqrt{100-a}\right)^{2}.
100-a
Calculate \sqrt{100-a} to the power of 2 and get 100-a.
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