exam Maths Puzzle Numerical Ability

15x-20 factor it completly, please.

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can you tell me if this is the correct answer
simplify (6x^3+5x^2-2)-(11x^3-2x+8)=6x^3-11x^3+5x^2+2x-2-8=5x^3+5x^2+2x-10 solve

log base is 3.4 ans is 5 and exponent is 2x-1