Solving x + √x = 6

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EngTechno
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I have got stuck with this simple problem,

x +x^1/2=6 ( x plus square root of x is equal to 6 )

Although I know the answer is 4, I don't know how to systmatically calculate this problem. Do you know? And how?
 
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Let u = [itex]\sqrt{x}[/itex], and then you have a quadratic in u.

--J