3 years ago

Which expression represents the number 5i4+2i3+8i2+−4 rewritten in a+bi form?

Mathematics

2 answers:

aniked [119]3 years ago

8 0

Remember
i²=-1 so
i³=-i
i⁴=1

so
5i⁴+2i³+8i²-4
5(1)+2(-i)+8(-1)-4
5-2i-8-4
-7-2i is the form

Vinvika [58]3 years ago

6 0

Answer:

Thats not the answer. I need help with this answer too.

These are the answers we're supposed to choose from:

−3+2i

5+0i

5−2i

−3−4i

−3+0i

Which one is it?

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