Rational Equation 501A5C
1. The problem is to express the equation $\frac{1}{x-2} - \frac{2}{x+5} = \frac{3}{x+1}$ in the form $ax^2 + bx + c = 0$.
2. To do this, we first find a common denominator for the fractions, which is $(x-2)(x+5)(x+1)$.
3. Multiply both sides of the equation by the common denominator to clear the fractions:
$$ (x+5)(x+1) - 2(x-2)(x+1) = 3(x-2)(x+5) $$
4. Expand each term:
- $(x+5)(x+1) = x^2 + 6x + 5$
- $2(x-2)(x+1) = 2(x^2 - x - 2) = 2x^2 - 2x - 4$
- $3(x-2)(x+5) = 3(x^2 + 3x - 10) = 3x^2 + 9x - 30$
5. Substitute back into the equation:
$$ x^2 + 6x + 5 - (2x^2 - 2x - 4) = 3x^2 + 9x - 30 $$
6. Simplify the left side:
$$ x^2 + 6x + 5 - 2x^2 + 2x + 4 = -x^2 + 8x + 9 $$
7. So the equation becomes:
$$ -x^2 + 8x + 9 = 3x^2 + 9x - 30 $$
8. Bring all terms to one side:
$$ -x^2 + 8x + 9 - 3x^2 - 9x + 30 = 0 $$
9. Combine like terms:
$$ -4x^2 - x + 39 = 0 $$
10. The equation in the form $ax^2 + bx + c = 0$ is:
$$ -4x^2 - x + 39 = 0 $$
This is the required quadratic form.