# Second Opinion On Hw Answer

• Aug 31st 2007, 02:45 PM
sasha9193
X/5X-6 - 3X/2X-5 =

<br><br>INTO ONE SIMPLE FRACTION FORM

USING MY TECHNIQUE I GOT AN ANSWER, PLZ SOME OTHER PPL SUBMIT THE ANSWER THEY GET CUS IT IS VERY IMPORTANT AND WANT TO MAKE SURE I HAVNT MADE ANY SILLY MISTAKES<br>
• Aug 31st 2007, 02:49 PM
red_dog
• Aug 31st 2007, 02:52 PM
sasha9193
I GOT 2Xsquared-2X/15Xsquared-37X+30
• Aug 31st 2007, 02:58 PM
sasha9193
Red dog u do it, wot u get? i wouldnt be so needy but its like really important i get this right
• Aug 31st 2007, 03:02 PM
red_dog
$\displaystyle\frac{x}{5x-6}-\frac{3x}{2x-5}=\frac{x(2x-5)-3x(5x-6)}{(5x-6)(2x-5)}=$
$\displaystyle =\frac{-13x^2+13x}{10x^2-37x+30}$
• Aug 31st 2007, 03:15 PM
Soroban
Hello, Sasha!

Don't know what "your technique" is . . . but it's wrong.

Quote:

$\frac{x}{5x-6} - \frac{3x}{2x-5}$

We need a lowest common denominator
. . so we "convert" the fractions to the LCD.

$\frac{x}{5x-6}\cdot{\color{blue}\frac{2x-5}{2x-5}} - \frac{3x}{2x-5}\cdot{\color{blue}\frac{5x-6}{5x-6}} \;\;= \; \;\frac{x(2x-5) - 3x(5x-6)}{(5x-6)(2x-5)}$

. . $= \;\frac{2x^2 - 5x - 15x^2 + 18x}{(5x-6)(2x-5)} \;=\;\frac{-13x^2 + 13x}{(5x-6)(2x-5)} \;\;= \;\;\boxed{\frac{-13x(x-1)}{(5x-6)(2x-5)}}$