Final answer:
To subtract the given expressions and simplify, we find a common denominator, combine the numerators, and simplify the expression.
Step-by-step explanation:
To subtract the given expressions and simplify, we need to find a common denominator for both fractions. The common denominator in this case is (b²-4b-12). So, the expression becomes:
(b/(b²-4b-12)) - (6/(b²-4b-12))
Next, we can combine the numerators and rewrite the expression as:
((b-6)/(b²-4b-12))
Finally, if factor the denominator, the expression can be simplified further as:
((b-6)/((b-6)(b+2)))
The (b-6) terms cancel out, leaving us with the simplified expression:
1/(b+2)