Mathematics, 16.01.2021 01:00 Homepage10

Which expression is equivalent to21^3 sqrt15 - 9^3 sqrt 15 ? A.12
B.30^3 sqrt 15
C.12^3 sqrt 5
D.12^3 sqrt 15
I have tried to complete this And I get stuck like 15 mins into it.

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Which expression is equivalent to21^3 sqrt15 - 9^3 sqrt 15 ? A.12
B.30^3 sqrt 15
C.12^3...