Answer
$-42\sqrt 6$
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:
$-42\sqrt 6$
