exam Maths Puzzle Numerical Ability

graph f(x0 = 3X = 2 ok I think we first have to solve for x

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exam Other Question

graph all on a graph;
f(x)=log3 x+2
f(x)=log3 (x+2)
f(x)=log3 (x-2)
f(x)=log3 x how do you find the solution of the x when the equatins are like this..
2x^3+5x-7= 0 plz tell me step by step so i can try it with other problems.