check answer plz: (18k)/(5h - 4k) + (25h - 2k)/(4k - 5h)

[rls4973]

18k + 25h-2k
---- --------
5h-4k 4k-5h

what i got as the answer was

25h-16k
----------
4k-5h

thanks for your help!

 

[mmm4444bot]

Re: just need to know if this is right

18k + 25h-2k
---- --------
5h-4k 4k-5h

what i got as the answer was

25h-16k This numerator looks like it could be 25h - 20k
----------
4k-5h

Hi RLS:

I read the expression in your exercise as follows.

\(\displaystyle \frac{18k}{5h - 4k} \;+\; \frac{25h - 2k}{4k - 5h}\)

This expression simplifies to -5. Think: "factoring".

Cheers,

~ Mark



PS: Click the Code button if you want to "draw" fractions. Use the Preview button, too, before clicking Submit!

 18k      25h-2k
----- + -------
5h-4k    4k-5h

 

[rls4973]

Re: just need to know if this is right

u just lost me?

 

[mmm4444bot]

Re: just need to know if this is right

u just lost me?

Please confirm that the expression I typed is correct.

 

[rls4973]

Re: just need to know if this is right

yes it is correct but I got lost on the part about 18k and 2 k simplify to -5 and that equals 20K?

 

[mmm4444bot]

Re: just need to know if this is right

yes it is correct but I got lost on the part about 18k and 2 k simplify to -5 and that equals 20K?

Since the denominators are not the same, did you multiply the fraction on the left by (-1)/(-1) to get a common denominator before adding the two fractions?

If so, then you are adding -18k to -2k. That is why the numerator equals -20k + 25h.

Now consider that numbers -20 and 25. Recognize that both 20 and 25 contain a factor of 5. Can you factor out a 5?

 

[rls4973]

Re: just need to know if this is right

yes i did do that sorry thanks so much I see where my mistake was !