anonymous
  • anonymous
When solving x^2 - 4x = -7 by completing the square what value is added to both sides of the equation?
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
coefficient of x divided by 2 and then squared (-4/2)^2=?
anonymous
  • anonymous
Ok so 4? I work it out and 2 and 4. So how do you know which one it is? @CalebBeavers
anonymous
  • anonymous
-4/2=-2 -2^2=4

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anonymous
  • anonymous
Ok thanks!
anonymous
  • anonymous
\[x^2-4x=-7\] \[(x-2)^2=-7+4=-3\] \[x-2=\pm\sqrt{3}i\]\[x=2\pm\sqrt{3}i\]

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