Final answer:
To simplify the given expression, the least common denominator in its factored form is (g+5)(g-3). The LCD is identified by factoring the quadratic denominator of the given expressions.
Step-by-step explanation:
If we are to find the factored form of the least common denominator (LCD) to simplify the expression (g+1/g^2 + 2g - 15) + (g+3/g+5), we need to factor the denominators. The quadratic g^2 + 2g - 15 can be factored into (g+5)(g-3). Since g+5 is already presented in one of the fractions, the LCD will simply be the product of (g+5)(g-3) and (g+5), which is (g+5)(g-3). So, the factored form of the LCD is (g+5)(g-3).
To simplify expressions with different denominators, we find the LCD, rewrite each fraction with the LCD, and then add or subtract the numerators.