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reterrickeyfox205
23.08.2019 •
Mathematics
If f(x) = x^3 – 2x^2, which expression is equivalent to f(i)?
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Ответ:
f(i) = i³ - 2i².
i = √-1.
i³ = (√-1)³ = √-1 * √-1 *√-1 = -1*√-1 = -√-1 = -i
i² = (√-1)² = √-1 * √-1 = -1
f(i) = i³ - 2i² = -i - 2(-1) = -i + 2
f(i) = 2 - i
Ответ:
169.15 is the correct answer