Answer
$$6x^2 - 11xy +15y^2 .$$
Work Step by Step
By distributing the negative sign and combining the similar terms, we get
$$3x^2 - 4xy +5y^2 - (-3x^2) + (-7xy) + 10y^2\\
=6x^2 - 11xy +15y^2 .$$
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 6 - Cumulative Review - Page 265: 21
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