exam Maths Puzzle Numerical Ability

Can anyone give me a hand with this one? Thanks!

3^x-1 = 2

Give answer to four decimal places. Thanks again!

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exam Other Question

Simplify by combining like terms
(rad)63) -2(rad)28) +5(rad)7 i thought i had it then i didnt please help.
Also am i entering the radical thing the right way? radical of 63 = (rad)63 ? is this ok? The problem is 2/x^-4. I know the way to solve normal negative exponents so I tried that and got: 2/1/x^4, simplified to 2/x^4 because 2/1 is 2. I got 2/x^4 as a final answer. Is this correct?