exam Maths Puzzle Numerical Ability

Factor completely. b2 - ab - 6a2

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I am stuck on correct answer for:

(x-5)(3x + 4)=0 is:

I am not using a specific book. I am just practicing... A strong spring is mounted to a steel I-beam so that the spring hangs vertically. A weight is hung from the spring. The energy P (arbitrary units) stored in the spring is give