Asianswag5000
Asianswag5000 Asianswag5000
  • 15-10-2016
  • Mathematics
contestada

Which of the following is a solution of x2 + 2x = −2? (1 point)


x = 4 − 3i

x = −4 + 3i

x = −1 + i

x = 1 − i

Respuesta :

nobillionaireNobley
nobillionaireNobley nobillionaireNobley
  • 15-10-2016
x^2 + 2x = -2
x^2 + 2x + 2 = 0

[tex]x= \frac{-b\pm \sqrt{b^2-4ac} }{2a} \\x=\frac{-2\pm \sqrt{2^2-(4\times1\times2)} }{2\times1}\\x=\frac{-2\pm \sqrt{4-8} }{2}\\x=\frac{-2\pm \sqrt{-4} }{2}\\x=\frac{-2\pm2i }{2}\\x=-1\pm i[/tex]

Therefore, x = -1 + i or x = -1 - i

Therefore, the correct answer is the third option.
Answer Link
onlineschoolsadface
onlineschoolsadface onlineschoolsadface
  • 14-12-2020

Answer:

-1 + i or -1 -i

Step-by-step explanation:

Answer Link

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