SOLUTION: I am doing a practice apptitude test and have a question which is 3*=81 what is the value of * , they say the answer is 4 .I am having trouble understanding this. Could you please

Algebra ->  Equations -> SOLUTION: I am doing a practice apptitude test and have a question which is 3*=81 what is the value of * , they say the answer is 4 .I am having trouble understanding this. Could you please       Log On


   

Question 700262: I am doing a practice apptitude test and have a question which is 3*=81 what is the value of * , they say the answer is 4 .I am having trouble understanding this. Could you please explain this to me? Thankyou, Its been a long time since school for me.
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
prime factors of 81 are 3*3*3*3

3*3*3*3=81
so 3^4= 81
3^*=4=3^4
*=4