Normal Line Origin
1. **State the problem:** Find the equation of the normal line to the graph of the function
$$F(x) = (x^4 - 3x^2 + 2x)(x^3 - 2x + 3)$$
at the origin (point where $x=0$).
2. **Find $F(0)$ to confirm the point on the graph:**
$$F(0) = (0^4 - 3\cdot0^2 + 2\cdot0)(0^3 - 2\cdot0 + 3) = 0 \cdot 3 = 0$$
So the point is $(0,0)$.
3. **Find the derivative $F'(x)$ using the product rule:**
Let
$$u = x^4 - 3x^2 + 2x, \quad v = x^3 - 2x + 3$$
Then
$$u' = 4x^3 - 6x + 2, \quad v' = 3x^2 - 2$$
By the product rule,
$$F'(x) = u'v + uv' = (4x^3 - 6x + 2)(x^3 - 2x + 3) + (x^4 - 3x^2 + 2x)(3x^2 - 2)$$
4. **Evaluate $F'(0)$ to find the slope of the tangent at $x=0$:**
$$F'(0) = (4\cdot0 - 6\cdot0 + 2)(0 - 0 + 3) + (0 - 0 + 0)(0 - 2) = 2 \times 3 + 0 = 6$$
5. **Find the slope of the normal line:**
The normal line is perpendicular to the tangent, so its slope is the negative reciprocal:
$$m_{normal} = -\frac{1}{6}$$
6. **Write the equation of the normal line passing through $(0,0)$:**
Using point-slope form,
$$y - 0 = -\frac{1}{6}(x - 0)$$
Simplifies to
$$y = -\frac{1}{6}x$$
**Final answer:** The equation of the normal line to the graph of $F(x)$ at the origin is
$$y = -\frac{1}{6}x$$