Question

解不等式4的x次方减3乘以2的x次方加1再加上8小于等于0

Answer 1

4^x-3*2^(x+1)+8<=0
2^(2x)-6*2^x+8<=0
(2^x-2)(2^x-4)<=0
2<=2^x<=4
2^1<=2^x<=2^2
1<=x<=2