Simplify the expression. Do not assume that the variables represent positive numbers. 
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Q78: Multiply. (Assume the variables represent nonnegative real
Q79: Factor the expression as if it were
Q80: Divide. Q81: Rationalize the denominator in the following expression. Q82: Simplify the expression. Do not assume that Q84: Use Property 1 for Radicals to write Q85: The length of the diagonal of a Q86: Use Property 1 for Radicals to write Q87: Rationalize the denominator in the following expression. Q88: Substitute the given numbers a = 4,
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