Answer:
h) (3 - 2b)/4b²
k) (2b - 3a)/ab³
Step-by-step explanation:
h) 3/4b² - 1/2b
multiply 1/2b, both top and bottom, by 2b, so 1/2b = 2b/4b²:
3/4b² - 2b/4b² = (3 - 2b)/4b²
k) 2/ab² - 3/b³
multiply 2/ab², both top and bottom, by b, so 2/ab² = 2b/ab³:
multiply 3/b³, both top and bottom, by a, so 3/b³ = 3a/ab³:
2b/ab³ - 3a/ab³ = (2b - 3a)/ab³
