CPM Homework Help : CCA2 Problem 8-76

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8-76.

Calculate the value of each expression below.

$\sqrt { - 49 }$
Answer (a):
$7i$

$\sqrt { - 2 }$
Partial Answer (b):
$i\sqrt{2}$

$(4i)^2$
Answer (c):
$-16$

$(3i)^3$
Answer (d):
$- 27 i$

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