If K sqrt 28 sqrt 63 - sqrt 7 0 find K - WAEC Mathematics 1999 Question
If \(K\sqrt{28}+\sqrt{63}-\sqrt{7}=0\), find K.
A
-2
B
-1
C
1
D
2
correct option: 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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