# Help with these problems pleasse

• Feb 20th 2011, 10:21 AM
uga75
Help with these problems pleasse
1) 3n / n-1 - 1 / 3= -40/ 3n - 18

2) 2x / x-2 + 15 / x^2 - 7x + 10 = 3/x-5

im having trouble with these fractional equations . I'd appreciate any help. thanks a lot
• Feb 20th 2011, 10:44 AM
topsquark
Quote:

Originally Posted by uga75
1) 3n / n-1 - 1 / 3= -40/ 3n - 18

$\displaystyle \displaystyle \frac{3n}{n - 1} - \frac{1}{3} = - \frac{40}{3n - 18}$

First, factor out that denominator on the RHS.
$\displaystyle \displaystyle \frac{3n}{n - 1} - \frac{1}{3} = - \frac{40}{3(n - 6)}$

Now, to simplify this equation you will want to multiply both sides by the common denominator. In this case the denominators are n - 1, 3, and 3(n - 6). What is the common denominator of these three expressions?

-Dan
• Feb 20th 2011, 10:55 AM
Wilmer
Quote:

Originally Posted by uga75
2) 2x / x-2 + 15 / x^2 - 7x + 10 = 3/x-5

Please use brackets: 2x / (x-2) + 15 / (x^2 - 7x + 10) = 3 / (x-5)

Now factor (x^2 - 7x + 10)