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anonymous

  • 5 years ago

how would you integrate the sqrt of (9-x^2) from -3 to 3 . i tried trig sub with x = to 3 sin theta but i get a wrong answer at the end; it get 0

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  1. amistre64
    • 5 years ago
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    you will always get a zero.... becuase the left side cancels out the number for the right side

  2. amistre64
    • 5 years ago
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    you either need to move the graph itself to the right by 3 units and adjust the equation; or integrate half of it: from 0 to 3 and then double your result.

  3. amistre64
    • 5 years ago
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    or you could do F(a) - F(b) instead and take the absolute value

  4. amistre64
    • 5 years ago
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    4 - 4 = 0 -4 -(4) = -8 |-8| = 8

  5. anonymous
    • 5 years ago
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    The left side doesnt cancel the right side. It's an even function, you just did the integral wrong.

  6. anonymous
    • 5 years ago
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    no is was suposed to use the power reduction formulas for cos squared

  7. anonymous
    • 5 years ago
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    after you realize that step the problem is solved

  8. anonymous
    • 5 years ago
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    thanks you guys!

  9. amistre64
    • 5 years ago
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    huh... i guess I need to review that part ;) thanx space

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