kaleybear01ovk0hv kaleybear01ovk0hv
  • 16-12-2017
  • Mathematics
contestada

Which of the following is a solution of x^2 + 2x + 8?
A. 4 + i√7
B. −1 + i√7
C. 2 + i√7
D. −4 + i√7

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Аноним Аноним
  • 16-12-2017
x^2 + 2x + 8 = 0

(x + 1)^2 - 1 + 8 = 0

(x + 1)^2  =   -7

x + 1  = sqrt (-7)  = i sqrt7

x =  -1 + i sqrt7


Its B
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