book Maths Puzzle Numerical Ability

simplify the following algebraic expression

Multiply: (2s +5z)^2(s + 3z)^2

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book Other Question

How do you get the anwser to a square root... ex:
square root of:
132
67
83
if you can... could you give me the formula for solving a square root... What are the divisibilty rules to the numbers 13,14,15,16,17,18,19 and 20?