If a and b are positive integers, then 3a+b × 6a =
A. 182a+b
B. 18a(a+b)
C. 36(2a+b)
D. 9a+b · 2a
E. 32a+b · 2a
Rewrite 6a as (3 · 2)a. Then use the laws of exponents:
3a+b · (3 · 2)a
= 3a+b · 3a · 2a
= (3a+b · 3a) · 2a
= 32a+b · 2a
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Exam Details
This is a 20 question exam to help you study for the Math section of the SAT.
Taken: 3,706 times
Added: 11/19/2008
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Audience: High School
Tags: Math, SAT

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