book Maths Puzzle Numerical Ability

4+y=12

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book Other Question

if a/x-b/y=c and xy=1/c, then bx= 1.f(x)=3x-2 and g(x)=x^2-4 find f(0) -g(0)

2.solve by taking square roots :
2(x+3)^2-50=0

3.simpilfy square root of 81x^4y^5