3^(2x) - 3^(x+2) +8=0 i tried 3^(x)=y but what about the 3^(x+2) ?
Last edited by mr fantastic; January 8th 2010 at 10:07 PM. Reason: Moved from another thread
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Originally Posted by smmmc 3^(2x) - 3^(x+2) +8=0 i tried 3^(x)=y but what about the 3^(x+2) ? Notice that . So the equation becomes . Also notice that . So the equation becomes . This is a Quadratic Equation. Bring in a dummy variable . So the equation becomes . Therefore or or . So or or . You could also work out using natural logarithms. .
Last edited by mr fantastic; January 8th 2010 at 10:07 PM.
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