lizbeth696
20.09.2019 •
Mathematics
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
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Ответ:
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
Ответ: