book Maths Puzzle Numerical Ability

How do I handle the 1/2 power???

(3x-5)^1/2=2

Find real solution.

Thanks Caroline

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book Other Question

at work, Jack must stuff 1000 envelopes w/ advertisements. He can stuff 12 envelopes in one minute, and he has 112 envelopes already finished. Solve 1000 = 12n + 112 to find how many minutes it will take jack to complete the task 7x-8=3x+12

can you help me find x