SOLUTION: r/r-1 + r/r-9=1 and d/d+4 + d/d+9=1

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: r/r-1 + r/r-9=1 and d/d+4 + d/d+9=1      Log On


   

Question 179777: r/r-1 + r/r-9=1 and d/d+4 + d/d+9=1
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
r%2F%28r-1%29+%2B+r%2F%28r-9%29=1

r%28r-9%29+%2B+r%28r-1%29=r%5E2-10r%2B9
r%5E2-9r+%2B+r%5E2-r=r%5E2-10r%2B9
2r%5E2-10r=r%5E2-10r%2B9
r%5E2-9=0
%28r-3%29%28r%2B3%29=0
Two solutions : r=-3, 3
.
.
.
d%2F%28d%2B4%29+%2B+d%2F%28d%2B9%29=1

d%28d%2B9%29+%2B+d%28d%2B4%29=d%5E2%2B13d%2B36
d%5E2%2B9d+%2B+d%5E2%2B4d=d%5E2%2B13d%2B36
2d%5E2%2B13d=d%5E2%2B13d%2B36
d%5E2-36=0
%28d-6%29%28d%2B6%29=0
Two solutions : d=-6, 6