Mathematics
AnnabelPoulter
2016-04-18 11:47:12
Which of the following is a solution of x^2 + 2x + 8? 4 + i times the square root of 7 −1 + i times the square root of 7 2 + i times the square root of 7 −4 + i times the square root of 7
ANSWERS
Jperson
2016-04-18 13:03:32

x^2 + 2x + 8 = 0 x^2 + 2x = -8 x^2 + 2x + 1 = -8 + 1 (x + 1)^2 = -7 x + 1 = (+-) sqrt -7 x = -1 (+-) sqrt -7 solution is : x = -1 + i * sqrt 7

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