Verified answer

3^4b=121

log 3 ^ 4b = log 121

4b log 3 = log 11^2

4b log 3 = 2 log 11

2b log 3 = log 11

b = log 11 / (2log3)

你條問題原題是否(a+1)^2=3^4b,如果是,就是你將a算錯或題目錯誤。

係咪LOG數嚟架,,

我估係咁:

3^4b=121

3^4B=11^2

2blog3=2log11

b(4log3)=2log11

b=2log11/4log3

log(base:3)121=4b

b = [log(base:3)121]/4

= 1.09(3 sig.fig.)