book Maths Puzzle Numerical Ability

Set of all leaves on a tree. {Infinite Set/Finite Set}

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book Other Question

(3+square root of -5)times(7-(square root of -10) I need someone to explain these for me... it says to Find the GCF of the first two terms and the GCF of the last two terms for each polynomial.

10p^3-25p^2+4p-10

6n^3+3n^2+2n+1