exam Maths Puzzle Numerical Ability

Help please
I am trying to figure out how to factor this to get the difference of two cubes:
27-u^3. Thank you!!!

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exam Other Question

if my problem was5x+9=39 and i had to do five steps how would i solve this problem "ringing the Changes" is a process where the bells in a tower are rung and all possible permutations. Westminster abbey has 10 bells in its tower. In how many ways can its bells be rung?