Evaluate
\left(15625-a\right)^{3}
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3814697265625-732421875a+46875a^{2}-a^{3}
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\left(15625-a\right)^{3}
Calculate 5 to the power of 6 and get 15625.
3814697265625-732421875a+46875a^{2}-a^{3}
Use binomial theorem \left(p-q\right)^{3}=p^{3}-3p^{2}q+3pq^{2}-q^{3} to expand \left(15625-a\right)^{3}.
\left(15625-a\right)^{3}
Calculate 5 to the power of 6 and get 15625.
3814697265625-732421875a+46875a^{2}-a^{3}
Use binomial theorem \left(p-q\right)^{3}=p^{3}-3p^{2}q+3pq^{2}-q^{3} to expand \left(15625-a\right)^{3}.
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