Question

3(х+2 степень)-3(х+1 степень)+3(х степень)=6

Answer 1

3^(x+2) -3^(x+1) +3^x = 6
3^x(3^2 - 3^1 +1) = 6
3^x(9-3+1) =6
3^x*7 = 6
3^x= 6/7
xlg3=lg6 - lg7
x = (lg6 - lg7)/lg3