Answer
$x^4-y^2$
Work Step by Step
RECALL:
$(a+b)(a-b) = a^2+b^2$
Use the formula above to have:
$(x^2+y)(x^2-y)
\\=(x^2)^2 - y^2
\\=x^4-y^2$
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 10 - Section 10.4 - Special Products - Exercise - Page 352: 16
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