book Maths Puzzle Numerical Ability

Please help me work through this problem:

x - 5x^1/2 + 6 = 0

I know the answer is {4,9}

Thanks!

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book Other Question
a 16 foot guywire reaches from the top of a pole to a point on the ground 9 feet from the bottom of the pole? Find det A, given A = [-1 0 1
2-1 3
0 1 5]