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simplifying radical expression

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1) Use rational exponents to simplify.

2) Simplify by factoring. Assume that all expressions under radicals representing nonnegative numbers.
sqrt(50a^2*b)

3) Find a polynomial for the perimeter and for the area. The top of the rectangle is n+4, the right side is n. The perimeter is ? (Simplify your answer do not factor.)

4) Simplify by taking roots of the numerator and the denominator. Assume that all expressions under radicals represent positive numbers.

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The solution explains how to simplify the radical expressions.

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