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because for the given equation put any real no (except one) it will greater than 0 and for x =1 it will be equal to zero ... so the equation stands true for all real numbers as it says greater than or equal to zero ... so all real numbers satisfies the condition

The square of any real number is greater than 0 and in this equation when x =1 it becomes 0 and since the equation says greater than or equal to zero that means all the real numbers are covered .



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