book Maths Puzzle Numerical Ability

True or false, the function f(x) =3x
grows three times faster than the function g(x)=X

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book Other Question

Question: cubed root of x squared=9
After cubing both sides, the 9 becomes 729
leaving the equation x squared=729
Please help solve for x
Any help appreciated!!
Thank you
please help me with this.

4x + 2 = -28.4

will you show me how you did it?