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BMF96

  • 3 years ago

r = -6 sinθ Part I: Multiply both sides of this equation by r and use the fact that to rewrite this equation in terms of x and y. I got x^2 + y^2 = -6y Part II: Complete the square to produce the final equation. Part III: Using only your answer to part II, what shape does this graph make?

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  1. LogicalApple
    • 3 years ago
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    So you want to move 6y over to the left side to obtain: x^2 + y^2 + 6y = 0 Then complete the square for the y variables. To do this, you'd take 6, divide it by 2, then square the result. You should end up with 9. |dw:1359140495765:dw|

  2. BMF96
    • 3 years ago
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    I don't completely understand. What is the final equation? x^2 + (y+3)^2 - 9?

  3. BMF96
    • 3 years ago
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    which seems to simplify to x^2 + y^2

  4. LogicalApple
    • 3 years ago
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    No, you simply completed the square. There is no way to simplify it to x^2 + y^2. However, if you remember, your equation is now equal to 0. x^2 + (y + 3)^2 - 9 = 0 Add 9 to both sides and see if you recognize this type of equation.

  5. BMF96
    • 3 years ago
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    looks like a circle with the origin at -3

  6. BMF96
    • 3 years ago
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    and radius of 3

  7. LogicalApple
    • 3 years ago
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    Right. A circle centered at (0, -3) with radius 3. And that's all there is to it :)

  8. BMF96
    • 3 years ago
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    Right, Thanks!

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