book Maths Puzzle Numerical Ability

I am so confused in algebra 1. And I would like to know what 11z^3-9z^2+5z-5 is, if you don't mind. And if you can please explain it to me, thank you.

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how do i solve this problem using the difference of perfect squares:100x-121= Solve this problem please. 5 radical 6 minus 1 all over 5 and i was wondering if you could simplify any. Thank You!