Question
Quantitative Aptitude Question on Algebra
If 92x–1–81x−1=1944, then x is
A
3
B
49
C
94
D
31
Answer
49
Explanation
Solution
9(2x−1)−81(x−1)=1944
9(2x−1)−9(2x−2)=1944
92x−2×8=1944,
3(4x−4)=35
4x−4=5
x=49
If 92x–1–81x−1=1944, then x is
3
49
94
31
49
9(2x−1)−81(x−1)=1944
9(2x−1)−9(2x−2)=1944
92x−2×8=1944,
3(4x−4)=35
4x−4=5
x=49