A curve has equation , where . The curve has a maximum point at , while the curve has a vertical asymptote with equation . Find the equation of the curve .
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Worked solution
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1. Express the condition that the curve has a stationary point at $x=1$ as an equation in terms of $a$ and $b$.
At the stationary point , :
2. Express the condition that the curve passes through the maximum point $(1, -32)$ as an equation in terms of $a, b$, and $c$.
Since the curve passes through , we have :
3. Relate the vertical asymptote of $y = \frac{1}{f(x)}$ to the roots of $f(x)$ to form a third equation.
For the curve to have a vertical asymptote at , the denominator must be zero at this point. Hence, .
4. Solve the system of linear equations simultaneously to find $a, b$, and $c$, and state the equation of the curve.
From (1), we can express in terms of :
Substitute into (2):
Substitute both and into (3):
Substitute back into the expressions for and :
Thus, the equation of the curve is .
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