Verified Answer :

apologiabiology

so factor -27
-27=-1 times 3 times 3 times 3
∛(-1 times 3 times 3 times 3)=3 times ∛-1
remember that ∛-1=-1
2 times ∛-1=3 times -1=-3
now we have
5 times (-3)+18
5 times -3=-15
-15+18=3
answer is 3

JoshuaCho

You cannot have a negetive number inside a cube root. So we use an "i" instead.

This is how you do it:
\(5 \sqrt[3]{-27} + 18\)                   \(\sqrt[3]{-27}\) becomes \(3i\)
\(5(3i) + 18\)                       multiply
\(15i + 18\)                         reduce
\(3(5i + 6)\)


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