Lowe Ryan
06/26/2024 · Junior High School
What is the sum of the reciprocals of the roots of the equation \( \frac{2003}{2004} x+1+\frac{1}{x}=0 \) ? \( \begin{array}{ll}\text { (A) }-\frac{2004}{2003} & \text { (B) }-1 \\ \text { (C) } \frac{2003}{2004} & \text { (D) } 1\end{array} \)
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Step-by-step Solution
To find the sum of the reciprocals of the roots of the equation
\[
\frac{2003}{2004} x + 1 + \frac{1}{x} = 0,
\]
we start by multiplying through by \( x \) (assuming \( x \neq 0 \)) to eliminate the fraction:
\[
\frac{2003}{2004} x^2 + x + 1 = 0.
\]
Next, we can rewrite this as:
\[
\frac{2003}{2004} x^2 + x + 1 = 0.
\]
To find the sum of the reciprocals of the roots, we denote the roots of the quadratic equation as \( r_1 \) and \( r_2 \). The sum of the reciprocals of the roots can be expressed as:
\[
\frac{1}{r_1} + \frac{1}{r_2} = \frac{r_1 + r_2}{r_1 r_2}.
\]
Using Vieta's formulas, we know that for a quadratic equation of the form \( ax^2 + bx + c = 0 \):
- The sum of the roots \( r_1 + r_2 = -\frac{b}{a} \).
- The product of the roots \( r_1 r_2 = \frac{c}{a} \).
In our case, we have:
- \( a = \frac{2003}{2004} \),
- \( b = 1 \),
- \( c = 1 \).
Calculating the sum of the roots:
\[
r_1 + r_2 = -\frac{b}{a} = -\frac{1}{\frac{2003}{2004}} = -\frac{2004}{2003}.
\]
Calculating the product of the roots:
\[
r_1 r_2 = \frac{c}{a} = \frac{1}{\frac{2003}{2004}} = \frac{2004}{2003}.
\]
Now substituting these values into the expression for the sum of the reciprocals of the roots:
\[
\frac{1}{r_1} + \frac{1}{r_2} = \frac{r_1 + r_2}{r_1 r_2} = \frac{-\frac{2004}{2003}}{\frac{2004}{2003}} = -1.
\]
Thus, the sum of the reciprocals of the roots is
\[
\boxed{-1}.
\]
Quick Answer
The sum of the reciprocals of the roots is -1.
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