Log47x
– Log4(x+3)-Log45=0.
Solution
Log47x
– Log4(x+3)-Log45=0.
Log44x
– [ Log4(x+7) + Log45]=0.
Log4{4x/(x+7)5}
=0.
4x
= 40
= 1
5(x+7)
4x
= 1
5x+35
5x
+ 35 = 4x
5x
- 4x + 35 = 0
5x
- 4x = - 35
x
= -35
Hence x=-35
TRY
THIS………………………..
NECTA
2011, QN 2a
Log45x
– Log4(x+2) - Log43 = 0.
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