renec84411 renec84411
  • 24-01-2022
  • Mathematics
contestada

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

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jimrgrant1 jimrgrant1
  • 24-01-2022

Answer:

y = - 8 + 2i

Step-by-step 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

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