exam Maths Puzzle Numerical Ability

hello it would be help full if you can answer this proof; it is #5 on page 205

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exam Other Question

solve the following equation:
1.square root of 2x+5 - square root of 2x =1

simplify:
2.cube root of 32 a^16 b^9 c^11

3.quad root of 12ab^3 multipy quad root 4a^5b^2

4.(8 "With the exception of 2 and 3, every prime number is a multiple of 6, add or take away 1. Is this true?"