Second Derivative Initial 9677A4
1. **State the problem:** We are given the differential equation $$y'' = 32^3$$ with initial conditions $$y(4) = 1$$ and $$y'(4) = 4$$. We need to find the function $$y(x)$$.
2. **Recall the formula and rules:** The equation $$y'' = C$$ where $$C$$ is a constant means the second derivative of $$y$$ is constant. To find $$y$$, integrate twice.
3. **First integration:** Integrate $$y'' = 32^3$$ with respect to $$x$$ to find $$y'$$:
$$y' = \int 32^3 \, dx = 32^3 x + C_1$$
where $$C_1$$ is a constant of integration.
4. **Apply initial condition for $$y'$$:** Given $$y'(4) = 4$$,
$$4 = 32^3 \cdot 4 + C_1 \implies C_1 = 4 - 4 \cdot 32^3$$
5. **Second integration:** Integrate $$y'$$ to find $$y$$:
$$y = \int (32^3 x + C_1) \, dx = \frac{32^3}{2} x^2 + C_1 x + C_2$$
where $$C_2$$ is another constant of integration.
6. **Apply initial condition for $$y$$:** Given $$y(4) = 1$$,
$$1 = \frac{32^3}{2} \cdot 4^2 + C_1 \cdot 4 + C_2$$
Substitute $$C_1$$ from step 4:
$$1 = \frac{32^3}{2} \cdot 16 + (4 - 4 \cdot 32^3) \cdot 4 + C_2$$
Simplify:
$$1 = 8 \cdot 32^3 + 16 - 16 \cdot 32^3 + C_2$$
$$1 = 16 - 8 \cdot 32^3 + C_2$$
$$C_2 = 1 - 16 + 8 \cdot 32^3 = -15 + 8 \cdot 32^3$$
7. **Final solution:**
$$y = \frac{32^3}{2} x^2 + \left(4 - 4 \cdot 32^3\right) x + \left(-15 + 8 \cdot 32^3\right)$$
This is the function $$y(x)$$ satisfying the given differential equation and initial conditions.