exam Maths Puzzle Numerical Ability

how do i find the lateral area of a regular hexagonal pyramid with base edge 10 and lateral edge 13

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Im stuck on this problem.
It says solve

12/√(5x+6)=√(2x+5)

Thanks so much Divide: 5x^3-5x+1 by x-3

I tried factoring out the 5 and ended up with 5(x^2-x-3)+x as the answer
Am I anywhere close?????