Answer:
3x³(x + 5)
Step-by-step explanation:
1/x² - 4/(3x² + 15x)
Factor 3x² + 15x.
3x² + 15x
3x(x + 5)
Find the least common denominator.
(1 × 3x(x + 5))/(x² × 3x(x + 5)) - (4 × x²)/(3x² + 15x × x²)
(3x(x + 5))/(3x³(x + 5)) - (4x²)/(3x³(x + 5))
The least common denominator is 3x³(x + 5).
