3 ^ (x+1) - 2 * 3 ^ (x-2) = 75

Question

3 ^ (x+1) - 2 * 3 ^ (x-2) = 75

Answer 1

3^x(3-2*1/9)=75
3^x*25/9=75
3^x=75*9/25
3^x=3^3
x=3

Answer 2

3 ^ X * ( 3 - 2 * 1/9 ) = 75 
3 ^ X * ( 27/9  - 2/9 ) = 75
3 ^ X * 25/9 = 75 
3 ^ X = 75 : 25/9 
3 ^ X = 3 * 9 
3 ^ X = 3 ^ 3 
X = 3 

Comments

вопрос : откуда взялось 27/9?