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Which of the following is a solution of x^2 - 2x = -8?
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Which of the following is a solution of x^2 - 2x = -8?
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Jan 13, 2018
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Which of the following is a solution of x^2 - 2x = -8?
Mathematics
high-school
Akaedintov
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x^2-2x=-8 add 1 to both sides
x^2-2x+1=-7 now the left side is a perfect square
(x-1)^2=-7 take the square root of both sides
x-1=±√-7 add 1 to both sides
x=1±√-7 which is
x=1±i√7 so
x=1+i√7 and 1-i√7
Blasanka
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Jan 19, 2018
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Blasanka
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