book Maths Puzzle Numerical Ability

a^2-9ab+81b^2

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I need help in solving - dividing monomials.

Ex: (5b to the 4th square n)to the 2th square divide by 2a to the 6th square
Pls help me with the prpoper steps in solving this pr I am currently reviewing for a placement test and have not taken any math courses in nearly 3 years. I know that I have learned to do all of the topics included in the sample prob