Add or subtract as indicated.
-$21 \sqrt { 7 } - 6 \sqrt { 7 }$
A) $27 \sqrt { 7 }$
B)105
C) $15 \sqrt { 7 }$
D)15

Name: Add or subtract as indicated. -$21 \sqrt { 7 } - 6 \sqrt { 7 }$ A) $27 \sqrt { 7 }$ B)105 C) $15 \sqrt { 7 }$ D)15
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Question

Quizplus · Accepted Answer

When adding or subtracting terms with the same radical part, you combine the coefficients. Here, $21 \sqrt{7} - 6 \sqrt{7} = (21 - 6) \sqrt{7} = 15 \sqrt{7}$.

Add or Subtract as Indicated 217−6721 \sqrt { 7 } - 6 \sqrt { 7 }217​−67​

Add or Subtract as Indicated $21 \sqrt { 7 } - 6 \sqrt { 7 }$