Answer :

Let's simplify each of the given expressions step by step.

### Expression 1: [tex]\(\frac{x^2 + 6}{4x - 16}\)[/tex]

1. Factor the Denominator:
The denominator can be factored as:
[tex]\[ 4x - 16 = 4(x - 4) \][/tex]

2. Rewrite the Expression:
Substitute the factored form of the denominator:
[tex]\[ \frac{x^2 + 6}{4(x - 4)} \][/tex]

### Expression 2: [tex]\(\frac{5x^2}{x^2 - 16}\)[/tex]

1. Factor the Denominator:
The denominator can be factored as:
[tex]\[ x^2 - 16 = (x - 4)(x + 4) \][/tex]

2. Rewrite the Expression:
Substitute the factored form of the denominator:
[tex]\[ \frac{5x^2}{(x - 4)(x + 4)} \][/tex]

### Expression 3: [tex]\(\frac{2x - 7}{2x + 8}\)[/tex]

1. Simplify the Numerator and Denominator:
There is no immediate factoring or simplification that can be done on each part, but we can simplify the coefficients.

2. Rewrite the Expression to Match the Simplified Coefficients:
Notice that:
[tex]\[ 2(x - \frac{7}{2}) = 2x - 7 \quad \text{and} \quad 2(x + 4) = 2x + 8 \][/tex]

Therefore, the expression becomes:
[tex]\[ \frac{x - \frac{7}{2}}{x + 4} \][/tex]

Putting it all together, the simplified forms of the given expressions are:

[tex]\[ \frac{x^2 + 6}{4(x - 4)}, \quad \frac{5x^2}{(x - 4)(x + 4)}, \quad \frac{x - \frac{7}{2}}{x + 4} \][/tex]