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tatiyna
3 years ago
10

Solve for number eight

Mathematics
2 answers:
Anna71 [15]3 years ago
7 0
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
alukav5142 [94]3 years ago
3 0
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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