When you multiply identical bases with exponents, you add the exponents (ie
note: bases must be the same).
Multiply the common bases together and the constants together. When you divide bases with exponents, you subtract the exponents (ex 
Divide identical bases by subtracting exponents.
Rewrite
and
to 1
Reduce the fraction
Here is the simplified form
Check:
Let a=1 and b=2
(\frac{14a^3b^2}{-9b^4}))
Plug in values
(\frac{56}{-144}))


Now lets compare this to our answer
Let a=1 and b=2

Plug in values


Since these 2 answers are equal, it verifies our answer. Hope this helps.