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A numeric or algebraic expression that contains two or more radical terms with the same radicand and the same index — called like radical expressions — can be simplified by adding or subtracting the corresponding coefficients.
asqrt(x)± bsqrt(x)=(a± b)sqrt(x)
Here, a,b, and x are real numbers and n is a natural number. If n is even, then x must be greater than or equal to zero.