Answers

2016-07-18T21:30:57+08:00
M^2 + 8m = -7
m^2 + 8m + 16 = -7 + 16
m^2 + 8m + 16 = 9
(m + 4)^2 = 9
√(m + 4)^2 = √9
m + 4 = ±3

m + 4 = 3
m = 3 - 4
m = -1

m + 4 = -3
m = -3 - 4
m = -7
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