# Chapter 10 - Radical Expressions and Equations - Chapter Review - Page 654: 23

$-42\sqrt 6$

#### Work Step by Step

You are given $-(3\sqrt {14})$$(-2\sqrt {21}).Rewrite the expression: -(3 \times 2)$$\sqrt {14\times21}$. Simplify the expression: $-6\sqrt {7\times 2\times 7\times 3}$ .Combine and simplify: $-42\sqrt 6$

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