exam Maths Puzzle Numerical Ability

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(3x^2 under the radical sign) + (2 outside radical sign 48x^2 under the radical sign) + (3 outside radical sign 48x^2 under the radical sign)

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exam Other Question

complete the square on the parabola 3y=x^2-6x+3 It says find an equation of the inverse relation. So those equation for y, if possible, and state whether or not the inverse relation is a function.
The problem is g(x)=1/2x-1.