x²=7 is a rational or irrational number
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√7 is an irrational number.
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x²= 7
=> x =√7
And √7 is irrational, Because √7 can't be used as fraction for any integers and it has decimal expansions that neither terminate nor become periodic and the major reason is that it is a transcendental number(numbers which are not the root of a non-zero polynomial with rational coefficients)
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