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Saturday, July 3, 2021

2021/049) Solve the equation x^3-3x= \sqrt{(x+2)}

 As RHS is not negative so we have x^2>=3

Trying the lowest integer >\sqrt{3} that is 2 we get this satisfies the equation.

Now squaring both sides we get x^2(x^2-3)^2 = x + 2

at x >2 LHS grows faster than RHS so x = 2 is the only solution

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