1. **State the problem:** Solve the equation $$\log_{10} \frac{x^2 - 24}{x} = 1$$.
2. **Recall the definition of logarithm:** If $$\log_b A = C$$, then $$A = b^C$$.
3. **Apply the definition:** Here, base $$b = 10$$ and $$C = 1$$, so
$$\frac{x^2 - 24}{x} = 10^1 = 10$$.
4. **Rewrite the equation:**
$$\frac{x^2 - 24}{x} = 10$$
5. **Multiply both sides by $$x$$ to clear the denominator:**
$$\cancel{x} \cdot \frac{x^2 - 24}{\cancel{x}} = 10x$$
which simplifies to
$$x^2 - 24 = 10x$$.
6. **Bring all terms to one side to form a quadratic equation:**
$$x^2 - 10x - 24 = 0$$.
7. **Solve the quadratic equation using the quadratic formula:**
$$x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}$$
where $$a=1$$, $$b=-10$$, and $$c=-24$$.
8. **Calculate the discriminant:**
$$\Delta = (-10)^2 - 4 \times 1 \times (-24) = 100 + 96 = 196$$.
9. **Find the roots:**
$$x = \frac{10 \pm \sqrt{196}}{2} = \frac{10 \pm 14}{2}$$.
10. **Calculate each root:**
- $$x = \frac{10 + 14}{2} = \frac{24}{2} = 12$$
- $$x = \frac{10 - 14}{2} = \frac{-4}{2} = -2$$
11. **Check the domain restrictions:**
- The argument of the logarithm must be positive:
$$\frac{x^2 - 24}{x} > 0$$.
- Also, $$x \neq 0$$.
12. **Test $$x=12$$:**
$$\frac{12^2 - 24}{12} = \frac{144 - 24}{12} = \frac{120}{12} = 10 > 0$$, valid.
13. **Test $$x=-2$$:**
$$\frac{(-2)^2 - 24}{-2} = \frac{4 - 24}{-2} = \frac{-20}{-2} = 10 > 0$$, but since $$x=-2$$ is negative and the denominator is negative, the fraction is positive, so it is valid.
14. **Final answer:** Both $$x=12$$ and $$x=-2$$ satisfy the equation and domain restrictions.
**Answer:** $$x = 12 \text{ or } x = -2$$.
Logarithm Solve Ca048B
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