exam Maths Puzzle Numerical Ability

Question #1: Simplify: (2 root3 -4)squared

#2: Solve and check: root y+2 =4-y

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exam Other Question

keep getting stuck on this one
Use synthetic division to divide (x^3+8x^2+21x+20) / (x+4).
thanks for your help How do I find the domain of g(t)=log(t+2) and g(x)=ln(x-4)