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Tricky Exponents

SATMAT-AVJF1E

$\left( { x }^{ a }-m \right) \left( { x }^{ a }+m \right) \left( { x }^{ 2a }+{ m }^{ 2 } \right)$ is equivalent to which of the following?

A

${ x }^{ 4a }-{ m }^{ 4 }$

B

${ x }^{ { 2a }^{ 3 } }+\left( m{ x }^{ a } \right) ^{ 2 }-{ m }^{ 2 }{ x }^{ 2a }-{ m }^{ 4 }$

C

${ x }^{ 2{ a }^{ 2 } }-{ m }^{ 4 }$

D

$\\\ \quad { \left( { x }^{ a }-m \right) }^{ 4 }$