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#1 Ron90

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Posted 21 January 2008 - 07:37 PM

Yeah im again stuck at a question:

(b) Determine the exact value of the
x-coordinate of P, the point where
the graph intersects the x-axis


I have figured out the eq of function is: y = 2Sin(3x)-1 0<x<120



Any ideas? Thanks

#2 Marcus

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Posted 21 January 2008 - 07:55 PM

Are you sure you have the correct equation there...I'm getting 2 answers blink.gif blink.gif
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#3 Ron90

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Posted 21 January 2008 - 08:00 PM

QUOTE(Marcus @ Jan 21 2008, 07:55 PM) View Post
Are you sure you have the correct equation there...I'm getting 2 answers blink.gif blink.gif



yea i got 2 too, but one is >120 so i crossed that one out.

But the one i had left was 10, and the answer is 50 unsure.gif

#4 Marcus

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Posted 21 January 2008 - 08:06 PM

hmmmm, I got both 50 and 10, is there something in the question that ruled out 10?, and I think you ruled out the one >120 too early, make sure you don't ignore answers that are out of range until the very end, they may end up coming back into range wink.gif
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#5 Ron90

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Posted 21 January 2008 - 08:32 PM

QUOTE(Marcus @ Jan 21 2008, 08:06 PM) View Post
hmmmm, I got both 50 and 10, is there something in the question that ruled out 10?, and I think you ruled out the one >120 too early, make sure you don't ignore answers that are out of range until the very end, they may end up coming back into range wink.gif



Ok what you have is right, the graph shows it hits 0 twice before 60 and so that P points to the second one so that makes sense. Thanks! smile.gif





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