book Maths Puzzle Numerical Ability

I am having problems on these equations (2x+5)^2-(2x+5)-6=0 and (5x-2)^1/3=2

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book Other Question

If a number is added to its square the result is 56. find the number.

thank you
3[3-3(x+1)]+1=2(-14-x)+2x+14