act.3 b jaqueline j. lugo
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Act.3B Jaqueline J. Lugo.
AP47)D-
lnx+2 ln ( x−1 )−ln (x2−1 )−ln3=0
ln ( x ( x−1 )3 ( x+1 ) )=0
x (x−1 )=e0 (3 ( x+1 ) )
x (x−1 )=3 x+3
x2−4 x=3
x2−4 x−3=0
4±√(−4)2−4(1×−3)2×1
x=4±2√72
x=2±√7
AP29)D-
log2 (5 x+1 )−log22=0
log2( 5 x+12 )=020=5 x+1
2
5 x+1=20×2
5 x+1=2
5 x=−1+2
x=15
AP31)J-
2x−1=1
ln (2x−1)=ln 1
( x−1 ) ln 2=ln1
( x−1 ) ln 2=0
x=−1
AP46)C-
y−4−8 y−2−9=0
1y4
− 8y2
−9=0
1y4× y4− 8
y2× y4−9× y4=0× y4
1−8 y2−9 y4=0
(1+3 y ) (1−3 y ) (1+ y2 )=0→y=13
23 x+7=343❑
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