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abbie1

  • 2 years ago

When solving x^2 - 4x = -7 by completing the square what value is added to both sides of the equation?

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  1. CalebBeavers
    • 2 years ago
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    coefficient of x divided by 2 and then squared (-4/2)^2=?

  2. abbie1
    • 2 years ago
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    Ok so 4? I work it out and 2 and 4. So how do you know which one it is? @CalebBeavers

  3. CalebBeavers
    • 2 years ago
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    -4/2=-2 -2^2=4

  4. abbie1
    • 2 years ago
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    Ok thanks!

  5. satellite73
    • 2 years ago
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    \[x^2-4x=-7\] \[(x-2)^2=-7+4=-3\] \[x-2=\pm\sqrt{3}i\]\[x=2\pm\sqrt{3}i\]

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