Question

$\sqrt{(81) { - 2}^{?} }$
​

Answer 1

heya mate...

(81-2^x)^ 1/2= 0

81 = 2^x

2^x=81

2^x = 3^4

take log both sides

$x log(2) = 4 log(3) \\ x = 4 log(3 ) \div log(2) \\ x = 4 log(3 \div 2)$

hope it helps you