book Maths Puzzle Numerical Ability

i need help to figure out how to find square roots manually. Example: Find the square root of 529

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book Other Question

solve by substitution method
4x-3y=2
12x=6+9y
thanks very much for your help
I need to multiply this, cant seem to work it out. Please help me


(5√[2] + 3)(√[2] - 2√[3])