SOLUTION: Can someone help me? 4x/x+1 = ?/(x+1)(x-1) What is the missing ? Please help

Algebra ->  Numeric Fractions Calculators, Lesson and Practice -> SOLUTION: Can someone help me? 4x/x+1 = ?/(x+1)(x-1) What is the missing ? Please help      Log On


   

Question 277467: Can someone help me?
4x/x+1 = ?/(x+1)(x-1)
What is the missing ?
Please help
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
4x/x+1 = ?/(x+1)(x-1)
:
Replace ? with y
4x%2F%28x%2B1%29+=+y%2F%28%28x%2B1%29%28x-1%29%29
Cross multiply
y(x+1) = 4x(x+1)(x-1)
:
Divide by (x+1)
y = %284x%28x%2B1%29%28x-1%29%29%2F%28x%2B1%29
:
Cancel (x+1)
y = 4x(x-1)
:
Replacing the ?
4x%2F%28x%2B1%29 = %284x%28x-1%29%29%2F%28%28x%2B1%29%28x-1%29%29