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
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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