exam Maths Puzzle Numerical Ability

V= Bh; B

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The problem is 5s^3+30s^2+40s and I have to factor the expression completely. I got 5s(s^2+6s+8) and my question is how do I factor it out completely? can you please help me solve by the addition-or-subtraction method: (((12a-5b=18 15a-5b=30)))