Answer
$$15a^2+20ab.$$
Work Step by Step
We simplify by distributing 5a as follows:
$$5a(3a+4b)=5a(3a)+5a(4b)=15a^2+20ab.$$
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 5 - Review - Page 232: 25
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