exam Maths Puzzle Numerical Ability

9^x -3^x+1 +1 =0

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exam Other Question

The worker on machine A can complete a certain job in 6 hours. The worker on machine B can do the same job in 4 hours. In a rush situation, how long would it take both machinists to complete the job? 39. lnx+lnx^2=3
The answer is {e}, but hot did they get that?

41. logx+log(x-21)=2

The answer is {25}, but how did they get that?