exam Maths Puzzle Numerical Ability

I have a quesiton on how to fine the domain of a compostite funtion f*g

f(x) =x+6, g(x) =4/x+8

i think it is x is not equal to -14

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exam Other Question

If the sides of a square are decreased by 2 cm, the area is decreased by
36 cm2. What were the dimensions of the original square? I need to solve this system of 4 equations using Guassian Elimination and have only solved 3 equation systems using GE. Can you show me the steps for the 4 equations? x + y + 2z