Solve Cubic Quadratic 33Af3C
1. The problem is to analyze and solve the first equation: $2x^3 + y^2 = 1 - 4y$.
2. Start by rewriting the equation to isolate terms and simplify:
$$2x^3 + y^2 + 4y = 1$$
3. Notice that the $y$ terms form a quadratic expression $y^2 + 4y$. We can complete the square to better understand it:
$$y^2 + 4y = (y + 2)^2 - 4$$
4. Substitute back:
$$2x^3 + (y + 2)^2 - 4 = 1$$
5. Add 4 to both sides:
$$2x^3 + (y + 2)^2 = 5$$
6. This equation relates $x$ and $y$ implicitly. For given $x$, we can solve for $y$:
$$(y + 2)^2 = 5 - 2x^3$$
7. Taking square roots:
$$y + 2 = \pm \sqrt{5 - 2x^3}$$
8. Finally, solve for $y$:
$$y = -2 \pm \sqrt{5 - 2x^3}$$
9. Important note: The expression under the square root must be non-negative for real $y$:
$$5 - 2x^3 \geq 0 \implies 2x^3 \leq 5 \implies x^3 \leq \frac{5}{2}$$
10. This means $x \leq \sqrt[3]{\frac{5}{2}}$ for real solutions.
Final answer:
$$y = -2 \pm \sqrt{5 - 2x^3}$$ with domain $x \leq \sqrt[3]{\frac{5}{2}}$ for real $y$ values.