Answer
$$x^2+4$$
Work Step by Step
Expanding the equations by multiplying each term in parenthesis by each of the other terms in the other set of parenthesis, we find:
$$\left(x+2i\right)\left(x-2i\right)\\ x^2+4$$
Recall that:
$$ i^2 = -1 $$
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 9 Quadratic Relations and Conic Sections - 9.7 Solve Quadratic Systems - 9.7 Exercises - Mixed Review - Page 664: 56
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