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(xa)^b =

A. 18^2a+b

B. 18^a(a+b)

C. 3^6(2a+b)

D. 9^a+b · 2^a

E. 3^2a+b · 2^a

Rewrite 6^a as (3 · 2)^a. Then use the laws of exponents:
3^a+b · (3 · 2)^a
= 3^a+b · 3^a · 2^a
= (3^a+b · 3^a) · 2^a
= 3^2a+b · 2^a

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Added: 11/24/2008

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Taggged: Math, SAT

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