Question: 5. Solve the equation $$(x - 10)(x + 20) = 0$$.
1. **State the problem:**
Solve the equation $$(x - 10)(x + 20) = 0$$ for $x$.
2. **Formula and rule:**
If a product of two factors equals zero, then at least one of the factors must be zero. This is called the Zero Product Property.
3. **Apply the Zero Product Property:**
Set each factor equal to zero:
$$x - 10 = 0$$
$$x + 20 = 0$$
4. **Solve each equation:**
For $$x - 10 = 0$$:
Add 10 to both sides:
$$x - 10 + 10 = 0 + 10$$
$$x = 10$$
For $$x + 20 = 0$$:
Subtract 20 from both sides:
$$x + 20 - 20 = 0 - 20$$
$$x = -20$$
5. **Final answer:**
The solutions to the equation are $$x = 10$$ and $$x = -20$$.