exam Maths Puzzle Numerical Ability

I have to factor this polynomial , but I have no idea how to factor it..HELP ME

[8x^(6n)]-[6x^(3n)]-9

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exam Other Question

Please help with this problem

A rectangular picture window is 5 ft by 8 ft. Polly wants to put a trim molding around the window. How many feet of molding should she buy?

Thank you so much
x-4y-3z=6
What does y =?