Perfom the indicated operation. Simplify as possible.
8x/7x+28 - x-1/x+4 Am completely stuck

Question

Perfom the indicated operation. Simplify as possible.
8x/7x+28 - x-1/x+4 Am completely stuck

anonymous · Answer

This right? 

$$\frac{ 8x }{ 7x+28 } - \frac{ x-1 }{ x+4 }$$

anonymous · Answer

yes

anonymous · Answer

First you need a lowest common denominator.

anonymous · Answer

i got 8x/7

anonymous · Answer

x+4 can multiply into 7x+28, so 7x+28 is the LCD

anonymous · Answer

So you need to multiply the right side by 7 to get the same denominator.

anonymous · Answer

$$\frac{ x-1 }{ x+4 } x \frac{ 7 }{ 7 } = \frac{ 7x-7 }{ 7x+28 }$$

anonymous · Answer

So now you have $$\frac{ 8x }{ 7x+28 } - \frac{ 7x-7 }{ 7x+28 }$$

anonymous · Answer

so is the answer x-7/7x+28?

anonymous · Answer

Correct, just subtract across the top.

anonymous · Answer

so that is the final answer?

anonymous · Answer

Correct.

anonymous · Answer

Remember when subtracting fractions, you need to get an LCD first. Then the problem is easy.

anonymous · Answer

okay i really need help on this one

anonymous · Answer

11/x+3 = 19x+18/x^2+7x+12 - 18/x+4