SOLUTION: Please help me find the fifth term in this expression (x+3y)^8. I tired to solve it using the nCr on the calculator, but it didn't make any sense, so now I don't know what to do.

Question 737282: Please help me find the fifth term in this expression (x+3y)^8. I tired to solve it using the nCr on the calculator, but it didn't make any sense, so now I don't know what to do.
Answer by Ed Parker(21) (Show Source): You can put this solution on YOUR website!

The rth term of (A + B)^N is  

For (x + 3y)⁵        

Substitute x for A, 3y for B, 8 for N, and 5 for r

    

    

    

    

Now we use  nCr to find  

Press ON
Press CLEAR
Press 8
Press MATH
Press left arrow once to highlight PRB
Press 3
          Read 8 nCr
Press 4   Read 8 nCr 4
Press ENTER
          Read 70

Substitute 70 for 

     
  
    

Edwin

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