Square root of a number . . .
Consider the equation
x^2 -25=0, the solutions are 5&-5. Now consider , the equation x^2 +25=0. The solutions of this equation are square root of -25 which are not real numbers. As square root of a negative number is not real. It is called as imaginary number. Square root of -1 is imaginary and is denoted by i . The set of complex numbers is denoted by C and is of great importance in mathematics.
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