Answer:
x=i, -i.
Step-by-step explanation:
x^2-6=-7
x^2-6-(-7)=0
x^2-6+7=0
x^2+1=0
x^2=0-1
x^2=-1
(21, 28)
Multiply coordinates by 7.
x^2 + 14x + 49 = 0
78
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