CameraIcon
CameraIcon
SearchIcon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

Q6. Find the value of x:

a) (125/ 8) X (125/ 8)x = (5/2)18

b) 32x + 1 / 9 = 27

Open in App
Solution

1)
125/8 × (125/8)^x = (5/2)^18
(5/2)³×[(5/2)^3]^x = (5/2)^18
(a^m)^n = a^mn
(5/2)^3 × (5/2)^3x = (5/2)^18
a^m × a^n = a^m+n
=> (5/2)^3+3x = (5/2)^18
=> as bases are equal exponents are equal
=> 3+3x = 18
=> 3x = 15 => x = 15/3 = 5

2)
3^(2x+1) /9=27
3^(2x+1)=27×9
3^(2x+1)=243
(3)^2x+1=(3).^5
3 will cancel out
So,
2x+1=5
2x=5-1
2x=4
x=4/2
x=2

flag
Suggest Corrections
thumbs-up
4
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Thrust and Pressure
PHYSICS
Watch in App
Join BYJU'S Learning Program
CrossIcon