I see that you've uploaded an image showing a math problem involving the subtraction of rational expressions. Let me extract the relevant information and help solve the problem for you.

The expression seems to be:

$\frac{10}{25a^2 - b^2} - \frac{1}{5a^2 - ab}$

The next step is to find a common denominator and simplify the result.

Step-by-step Solution:

1. Factor each denominator:

   • $25a^2 - b^2$ is a difference of squares, which factors as: $25a^2 - b^2 = (5a - b)(5a + b)$
   • $5a^2 - ab$ can be factored by taking out the common factor of $a$: $5a^2 - ab = a(5a - b)$

2. Find a common denominator: The least common denominator (LCD) between $(5a - b)(5a + b)$ and $a(5a - b)$ is: $a(5a - b)(5a + b)$

3. Rewrite each fraction with the LCD: $\frac{10}{(5a - b)(5a + b)} = \frac{10a}{a(5a - b)(5a + b)}$ $\frac{1}{a(5a - b)} = \frac{(5a + b)}{a(5a - b)(5a + b)}$

4. Subtract the numerators: Now that the denominators are the same, we subtract the numerators: $\frac{10a - (5a + b)}{a(5a - b)(5a + b)}$ Simplifying the numerator: $10a - 5a - b = 5a - b$

5. Final result: The final expression is: $\frac{5a - b}{a(5a - b)(5a + b)}$ The $5a - b$ in the numerator and denominator cancel out (as long as $5a \neq b$), leaving: $\frac{1}{a(5a + b)}$

This is the simplified form of the given expression.

Do you want any additional details or clarifications on this?

Here are five related questions for further practice:

1. How do you simplify rational expressions with multiple terms?
2. What is the difference of squares formula?
3. How do you find a least common denominator (LCD)?
4. How do you handle subtraction when simplifying rational expressions?
5. What steps are involved in factoring quadratic expressions?

Tip: When dealing with rational expressions, always check for common factors that can be canceled out after you find a common denominator!