Evaluate y=x^2+x-4, given x=2i

Ji Sungbin asked May 13, 2023

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Ji Sungbin asked May 13, 2023

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18 votes

Answer:

y = - 8 + 2i

Explanation:

Substitute x = 2i into the equation, noting i² = - 1

y = (2i)² + 2i - 4

= 4i² + 2i - 4

= 4(- 1) + 2i - 4

= - 4 + 2i - 4

= - 8 + 2i

Chris Judge answered May 17, 2023

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