exam Maths Puzzle Numerical Ability

find the greatest commin factor or this polynomial

4c^3-8c^2+8

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exam Other Question

18 boys bought drinks.
Some chose apple juice that was 22p per glass and others chose orange juice at 24p per glass.
How many chose apple juice and how many chose orange juice?
how do I simplify the following

√(16x+32) + √(4x+8)

Thank you