1. **State the problem:** Simplify or factor the expression $\frac{4x^2 + x}{4x^2 - 7x - 2}$.
2. **Write the expression:**
$$\frac{4x^2 + x}{4x^2 - 7x - 2}$$
3. **Factor numerator and denominator:**
- Numerator: $4x^2 + x = x(4x + 1)$
- Denominator: Factor $4x^2 - 7x - 2$. Find two numbers that multiply to $4 \times (-2) = -8$ and add to $-7$. These are $-8$ and $1$.
Rewrite denominator:
$$4x^2 - 8x + x - 2 = (4x^2 - 8x) + (x - 2) = 4x(x - 2) + 1(x - 2) = (4x + 1)(x - 2)$$
4. **Rewrite the fraction:**
$$\frac{x(4x + 1)}{(4x + 1)(x - 2)}$$
5. **Cancel common factors:**
$$\frac{x\cancel{(4x + 1)}}{\cancel{(4x + 1)}(x - 2)} = \frac{x}{x - 2}$$
6. **Final answer:**
$$\boxed{\frac{x}{x - 2}}$$
This is the simplified form of the original expression, valid for $x \neq \frac{-1}{4}$ and $x \neq 2$ (to avoid division by zero).
Simplify Rational 809742
Step-by-step solutions with LaTeX - clean, fast, and student-friendly.