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anonymous

  • one year ago

NEED HELP!! Question: Using the following equation, find the center and radius of the circle. You must show all work and calculations to receive credit. Equation: x^2 - 4x + y^2 + 8y = -4

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  1. Loser66
    • one year ago
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    Where are you stuck?

  2. anonymous
    • one year ago
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    I really just don't know hwere to start.

  3. Loser66
    • one year ago
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    Do you know how to complete the square?

  4. anonymous
    • one year ago
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    Yes

  5. Loser66
    • one year ago
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    Ok, do it for me for both x and y. I meant x^2 -4x +................. to get a complete the square for x y^2+8y +.................. to get a complete the square for y

  6. anonymous
    • one year ago
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    okay, so would i use the equation (x -a) ^2 + (y-b) ^2 = r^2?

  7. Loser66
    • one year ago
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    Of course, but first off, you must complete the expressions above.

  8. anonymous
    • one year ago
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    I don't know how to solve the expression... Can you walk me through it?

  9. anonymous
    • one year ago
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    So, is 4 the center?

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