The graph of has a vertical asymptote with equation and an oblique asymptote with equation . It is given that .
- (a)
Write down the value of and show that and .
- (b)
Hence find the range of values of if the graph has no stationary points.
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Worked solution
2(a)
1. Find the value of $d$ using the given vertical asymptote.
A vertical asymptote occurs when the denominator evaluates to zero (and the numerator is non-zero).
Given the vertical asymptote is , the denominator must be zero when .
2. Express the rational function in quotient-remainder form to identify its oblique asymptote.
Substitute into the function equation:
By performing polynomial long division or expressing the numerator in terms of the denominator:
For large values of , the fractional term approaches .
Therefore, the equation of the oblique asymptote is .
3. Compare coefficients with the given oblique asymptote to show $a = 2$ and $b = 4$.
The given oblique asymptote is . Comparing this with :
Comparing the coefficient of :
Comparing the constant term:
2(b)
1. Substitute the values of $a$, $b$, and $d$ from part (a) into the function and differentiate with respect to $x$.
From part (a), , and , so the equation of the curve is
Differentiating using the quotient rule:
2. Apply the condition for no stationary points by considering the discriminant of the numerator.
For stationary points, , which requires the numerator to be zero:
For the graph to have no stationary points, this quadratic equation must have no real roots (since the denominator for ). Thus, the discriminant must be strictly less than zero:
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