Add or subtract the radical expressions as indicated, if possible. $9 \sqrt { 2 } + \sqrt { 162 } - 3 \sqrt { 18 }$
A) $54 \sqrt { 2 }$
B) $63 \sqrt { 2 }$
C) $9 \sqrt { 2 }$
D) $6 \sqrt { 146 }$

Question

Quizplus · Accepted Answer

The expression simplifies to $9 \sqrt{2} + 9 \sqrt{2} - 3 \cdot 3 \sqrt{2} = 9 \sqrt{2} + 9 \sqrt{2} - 9 \sqrt{2} = 9 \sqrt{2}$, since $\sqrt{162} = 9\sqrt{2}$ and $\sqrt{18} = 3\sqrt{2}$.

Add or Subtract the Radical Expressions as Indicated, If Possible 92+162−3189 \sqrt { 2 } + \sqrt { 162 } - 3 \sqrt { 18 }92​+162​−318​

Add or Subtract the Radical Expressions as Indicated, If Possible $9 \sqrt { 2 } + \sqrt { 162 } - 3 \sqrt { 18 }$