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

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

–2 + i
–2 – i
2 + i
2 – i

User Hossein Ahmadi
by
7.6k points

2 Answers

6 votes

Answer: D

Explanation:

just trust me

User Nacnudus
by
8.0k points
6 votes
f(i) = i³ - 2(i)²

Use the facts, i³ = -i and i² = -1

f(i) = 2 - i
User Rmanna
by
8.4k points
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