book Maths Puzzle Numerical Ability

Please help me solve: The square root of x+5=8

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book Other Question

1)simplify 3(2x+1)-3(x-1)(x+1)

2) If 2x+1=3 and 2x^2-5x-3=24, what does x-3 equal? (plz explain)

3)find k so that x^2-kx+25 is a perfect square (Explain plz)

4)what sho
solve this equation
square root (symbol) 5^2-9=2x
Thank you in advance