If \(K\sqrt{28}+\sqrt{63}-\sqrt{7}=0\), find K.
MATHEMATICS
WAEC 1999
If \(K\sqrt{28}+\sqrt{63}-\sqrt{7}=0\), find K.
- A. -2
- B. -1
- C. 1
- D. 2
Correct Answer: B. -1
Explanation
\(K\sqrt{28}+\sqrt{63}-\sqrt{7}=0\\
2K\sqrt{7}+3\sqrt{7}-\sqrt{7}=0\\
2K\sqrt{7}=-2\sqrt{7}\\
K=\frac{-2\sqrt{7}}{2\sqrt{7}}\\
K=-1\)
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