Answer:
A. x = -4 +/-√26.
Explanation:
x^2 + 8x = 10
using the completing the square identity:
x^2 + ax = (x + a/2)^2 - (a/2)^2 :
(x + 4)^2 - 4^2 = 10
(x + 4)^2 = 26
x + 4 = ± √26
x = -4 +/-√26.
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