1. **State the problem:** Given the system of equations:
$$x^2 = 2025x + y$$
$$y^2 = 2025y + x$$
Find the value of $$\frac{x}{y^2} + \frac{y}{x^2}$$.
2. **Rewrite the equations:**
From the first equation:
$$x^2 - 2025x = y$$
From the second equation:
$$y^2 - 2025y = x$$
3. **Substitute and analyze:**
We want to find:
$$\frac{x}{y^2} + \frac{y}{x^2}$$
Rewrite as:
$$\frac{x}{y^2} + \frac{y}{x^2} = \frac{x^3 + y^3}{x^2 y^2}$$
4. **Express $x^3$ and $y^3$ using the original equations:**
Multiply the first equation by $x$:
$$x^3 = 2025x^2 + xy$$
Multiply the second equation by $y$:
$$y^3 = 2025y^2 + xy$$
5. **Sum $x^3 + y^3$:**
$$x^3 + y^3 = 2025(x^2 + y^2) + 2xy$$
6. **Express denominator $x^2 y^2$ as $(xy)^2$:**
7. **Use the original equations to find relations between $x$ and $y$:**
From the first equation:
$$y = x^2 - 2025x$$
From the second equation:
$$x = y^2 - 2025y$$
8. **Try the symmetric solution $x = y$:**
Set $x = y = t$:
$$t^2 = 2025t + t \implies t^2 - 2026t = 0 \implies t(t - 2026) = 0$$
So $t = 0$ or $t = 2026$.
9. **Check $t=0$:**
Plug into original equations:
$$0 = 0 + 0$$
Valid.
10. **Check $t=2026$:**
$$2026^2 = 2025 \times 2026 + 2026$$
Calculate:
$$2025 \times 2026 = 2025 \times (2000 + 26) = 2025 \times 2000 + 2025 \times 26 = 4,050,000 + 52,650 = 4,102,650$$
Then:
$$2025 \times 2026 + 2026 = 4,102,650 + 2026 = 4,104,676$$
Calculate $2026^2$:
$$2026^2 = (2000 + 26)^2 = 2000^2 + 2 \times 2000 \times 26 + 26^2 = 4,000,000 + 104,000 + 676 = 4,104,676$$
So equality holds.
11. **Evaluate the expression for $x = y = 0$:**
$$\frac{0}{0^2} + \frac{0}{0^2}$$
Undefined (division by zero).
12. **Evaluate the expression for $x = y = 2026$:**
$$\frac{2026}{2026^2} + \frac{2026}{2026^2} = \frac{2026}{2026^2} + \frac{2026}{2026^2} = 2 \times \frac{2026}{2026^2} = 2 \times \frac{1}{2026} = \frac{2}{2026}$$
Simplify:
$$\frac{2}{2026} = \frac{1}{1013}$$
13. **Final answer:**
$$\boxed{\frac{1}{1013}}$$
Solve Expression 4Db00C
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