Armani1947 Armani1947
  • 04-08-2017
  • Mathematics
contestada

Which of the following is a solution of x^2 - 2x = -8?

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irspow
irspow irspow
  • 04-08-2017
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
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