Simplify the expression.
-$$\sqrt { 9 x ^ { 2 } }$$
A) $3 x ^ { 2 }$
B) $9 x$
C) $- 3 x$
D) $3 | \mathrm { x } |$

Name: Simplify the expression. -\[\sqrt { 9 x ^ { 2 } }\] A) $3 x ^ { 2 }$ B) $9 x$ C) $- 3 x$ D) $3 | \mathrm { x } |$
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Question

Quizplus · Accepted Answer

The square root of $9x^2$ simplifies to $3|x|$ because the square root and the square cancel each other out, leaving the absolute value to ensure the expression is non-negative, as required by the definition of a square root.

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Simplify the Expression $\sqrt { 9 x ^ { 2 } }$