book Maths Puzzle Numerical Ability

a load of 5kg stretches a spring to a length of 24 cm. a load of 8kg stretches it to a length of 30cm. find the length of the spring when there is no load.

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Looking for help to see if I got this right.

Multiply:
(m^2+n^2-mn)(m^2+mn+n^2)= m^4+m^2n^2+n^4
thank you for your help! simplify: 2 square root of 5 - 3 square root of 36 + 5 square root of 35