Question

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

Answer 1

This right?

\[\frac{ 8x }{ 7x+28 } - \frac{ x-1 }{ x+4 }\]

Answer 2

yes

Answer 3

First you need a lowest common denominator.

Answer 4

i got 8x/7

Answer 5

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

Answer 6

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

Answer 7

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

Answer 8

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

Answer 9

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

Answer 10

Correct, just subtract across the top.

Answer 11

so that is the final answer?

Answer 12

Correct.

Answer 13

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

Answer 14

okay i really need help on this one

Answer 15

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