Question

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Explanation:

Step1: Analyze the denominator

The fraction is $\frac{7}{a - 5}$. To create a common denominator (likely with $(a + 5)(a - 5)$ from the left side), we need to multiply numerator and denominator by $(a + 5)$ to get the denominator to $(a + 5)(a - 5)$.

Step2: Confirm the operation

Multiplying top (numerator) and bottom (denominator) by $(a + 5)$ will make the denominator $(a - 5)(a + 5)$, which matches the factored form of the other denominators in the equation. So we multiply top and bottom by $(a + 5)$.

Answer:

B. (a + 5), top and bottom.