If \(K\sqrt{28}+\sqrt{63}-\sqrt{7}=0\), find K.
-2
-1
1
2
Correct answer is B
\(K\sqrt{28}+\sqrt{63}-\sqrt{7}=0\)
\(2K\sqrt{7}+3\sqrt{7}-\sqrt{7}=0\)
\(2K\sqrt{7}=-2\sqrt{7}\)
\(K=\frac{-2\sqrt{7}}{2\sqrt{7}}\)
\(K=-1\)
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