book Maths Puzzle Numerical Ability

I need to multiply this, cant seem to work it out. Please help me

(5√[2] + 3)(√[2] - 2√[3])

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book Other Question

i need help to figure out how to find square roots manually. Example: Find the square root of 529 1.factor completely (5x^2+14x+13)^2-16((x^2+x-2)^2
2.factor out x^3+x^4y^4+y^6
3.a square has a perimeter of 12x+28cm.find its area.
4.a circle has a radius of 3x-5cm.find its a