If f(x) = x3 – 2x2, which expression is equivalent to f(i)? –2 + i –2 – i 2 + i 2

asked Sep 18, 2017 218k views

5 votes

If f(x) = x3 – 2x2, which expression is equivalent to f(i)?

–2 + i

–2 – i

2 + i

2 – I

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3 votes

Answer:

It's D

2-i

Explanation:

Cji answered Sep 19, 2017

by Cji

7.7k points

1 vote

the answer is
f(x) = x3 – 2x2
so f(i)=i^3 - 2i²
i²=-1
i^3=ixi²=-i
f(i)=i^3 - 2i²=-i-2x-1=-i+2
the answer is a. f(i)= –2 + i

Qwertz answered Sep 25, 2017

8.3k points

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