exam Maths Puzzle Numerical Ability

I would apprecaite some help with the following :

Simplify

3(m^-3)^-2 nm^3n^-1 / mm^2m^0m^-7(m^3)^3

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exam Other Question

Add: 1/x+2 + 8/x-2? I would appreciate any help with this problem.

Solve by completing the square
4x^2+2x-3=0