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anonymous

  • one year ago

Help medal will be given!!!! Using the following equation, find the center and radius: x2 - 4x + y2 + 8y = -4 The center is located at (-2, -4), and the radius is 4. The center is located at (2, -4), and the radius is 4. The center is located at (-2, -4), and the radius is 16. The center is located at (2, -4), and the radius is 16.

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  1. anonymous
    • one year ago
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    @pooja195 could you help plz

  2. welshfella
    • one year ago
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    convert to standard form by completing the square

  3. welshfella
    • one year ago
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    x2 - 4x + y2 + 8y = -4 = (x - 2)^2 - 4 + (y + 4)^2 - 16 = -4 = (x - 2)^2 + ( y + 4)^2 = 16

  4. anonymous
    • one year ago
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    so would it be B

  5. welshfella
    • one year ago
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    compare this with standard form (x - a)^2 + (y - b)^2 = r^2 where center = (a,b) and r = radius

  6. welshfella
    • one year ago
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    yes B

  7. anonymous
    • one year ago
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    thank you could you help me with another im stuck on

  8. welshfella
    • one year ago
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    ok

  9. anonymous
    • one year ago
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    ABCD is a quadrilateral inscribed in a circle:What equation can be used to solve for angle D?

  10. anonymous
    • one year ago
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  11. anonymous
    • one year ago
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    (2x + 16) + (6x - 4) = 90 (x + 16) - (x) = 90 (x + 16) + (2x + 16) = 180 (2x + 16) + (x) = 180

  12. welshfella
    • one year ago
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    opposite angles of a cyclic quadrilateral add up to 180 degrees

  13. welshfella
    • one year ago
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    what angle is opposite D?

  14. anonymous
    • one year ago
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    Is it B?

  15. welshfella
    • one year ago
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    no

  16. anonymous
    • one year ago
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    huh

  17. welshfella
    • one year ago
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    D + B = 180 - plug in the values of D and B

  18. anonymous
    • one year ago
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    (2x 16) + x =180

  19. welshfella
    • one year ago
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    yep

  20. anonymous
    • one year ago
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    thanks

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