Answer
$C=$ not a real number
Work Step by Step
$(-4)^{\frac{1}{2}}=\sqrt (-4)=$ not a real number
We cannot take the square root of -4, or a negative number in general, because there is no real number $a$ such that $a^{2}=-4$.
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 7 - Section 7.2 - Rational Exponents - Exercise Set - Page 425: 109
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