1. **State the problem:** Find the value(s) of $x$ that satisfy the equation
$$\frac{x(x - 3)}{(x + 1)^2} = \frac{3}{5}$$
2. **Formula and rules:** To solve this rational equation, we will cross-multiply to eliminate the denominator, then solve the resulting quadratic equation. Remember, $x \neq -1$ because it would make the denominator zero.
3. **Cross-multiply:**
$$5 \cdot x(x - 3) = 3 \cdot (x + 1)^2$$
4. **Expand both sides:**
Left side:
$$5(x^2 - 3x) = 5x^2 - 15x$$
Right side:
$$(x + 1)^2 = x^2 + 2x + 1$$
So,
$$3(x^2 + 2x + 1) = 3x^2 + 6x + 3$$
5. **Set the equation:**
$$5x^2 - 15x = 3x^2 + 6x + 3$$
6. **Bring all terms to one side:**
$$5x^2 - 15x - 3x^2 - 6x - 3 = 0$$
Simplify:
$$2x^2 - 21x - 3 = 0$$
7. **Solve the quadratic equation:**
Use the quadratic formula:
$$x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}$$
where $a=2$, $b=-21$, $c=-3$.
Calculate the discriminant:
$$\Delta = (-21)^2 - 4 \cdot 2 \cdot (-3) = 441 + 24 = 465$$
8. **Find the roots:**
$$x = \frac{21 \pm \sqrt{465}}{4}$$
9. **Check for restrictions:**
$x \neq -1$ which is not equal to either root.
**Final answer:**
$$x = \frac{21 + \sqrt{465}}{4} \quad \text{or} \quad x = \frac{21 - \sqrt{465}}{4}$$
Rational Equation 4418F9
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