M4maths Previous Puzzles

16 Oct 2019 Solve

If 4^(2x) = 1/32 , then x is

OPtion

1) 3/4
2) 3/8
3) 4/5
4) 5/4
5) 5/8
6) -4/5
7) -5/4
8) 5/3
9) -7/8
10) None of these

Solution

4^(2x) = 1/32
=> 2^4x = 1/(2^5)
=> 2^4x = 2^-5)
=> x = -5/4

Correct Option: 7 Best Solution (1)