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Verified Answer :

konrad509

\(50a^3+10a^2=10a^2(5a+1)\Rightarrow A\)

\(50a^3+10a^2\\\\50a^3=10\cdot5\cdot a^2\cdot a=10a^2\cdot5a\\\\50a^3+10a^2=10a^2\cdot5a+10a^2\cdot1=\huge\boxed{10a^2(5a+1)}\to\boxed{A}\)

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