How to check whether x is rational or irrational in the equation: x3 = 18.
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x=cube root of 18.cube root of 18 is zero
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Just divide 3 on both sides. On LHS, both the threes will cancel out each other and on the right hand side, 18 will divide 3 which on solving will give 6. This is the value of x and it is a rational number.
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