solve the problems...

题目

solve the problems...
(1)4^x + 2^x+1 -3 =0
(2)log(1/3)x + 2log 9(x^2) -1 =0

答案

1.设2^x为t,原式变为t^2+2t-3=0 => t=1 或t=-3(舍)
=> x=0；
2.原式变为,-log(3)x+2log(3)x-1=0 => x=3;