Answer
$0.7x^2-0.38x$
Work Step by Step
We simplify by removing the parentheses and combining the like terms as follows:
$$
0.6(0.5x^2 - 0.9x) + 0.4(x^2 +0.4x)
\\
=0.3x^2-0.54x+0.4x^2+0.16x
\\=0.7x^2-0.38x
.$$
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 5 - Section 5.2 - Simplifying Algebraic Expressions - Exercise - Page 218: 78
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