Question

i need someone to help. nobody is helping me and

Answer 1

im stressing

Answer 2

whats the problem?

Answer 3

sorry if that sounds rude

Answer 4

what is your question

Answer 5

hold on

Answer 6

Wally knows that in order to add or subtract rational expressions, he has to find the least common denominator first. Unfortunately, he can not remember how to do that. Using complete sentences, explain to Wally how to find least common denominators. Make sure you clearly explain any important items to consider.

Answer 7

Wally is very thankful for your help, but he is still stuck. Describe to Wally how adding and subtracting rational expressions is similar to adding and subtracting simple fractions, and how they are different

Answer 8

I have 5 written assignments to get done by 5

Answer 9

a rational expression is just a glorified fraction ... they add and subtract the same way

Answer 10

for the first one would it be you have to find the factors of the denominators and find the one that is common in both? Would that be the answer?

Answer 11

im sorry I am just really stressed and can't think straight

Answer 12

you do not need to find a "least" common denominator ... you simply need to find a common denominator.

Answer 13

all a "least" common denominator does is help out when trying to simplify a fraction ... but is not required to add or subtract them

Answer 14

it isn't? I thought it was

Answer 15

we can test it out ... assume that we do not know that 8 is the LCD, we could simply multiply the denominators together to find a common number that they share
\[\frac{3}{4}+\frac{1}{8}\]
\[\frac{3}{4}\frac{8}{8}+\frac{1}{8}\frac{4}{4}\]
\[\frac{24}{32}+\frac{4}{32}\]
now we can add them simply
\[\frac{24+4}{32}=\frac{28}{32}\]
it just is not in "simplest" form, but the operation can still be done

Answer 16

OOOHHH okay that makes it easier

Answer 17

28 and 32 both divisible by 2 soo ... \[\frac{28/2}{32/2}=\frac{14}{16}\]
still evens, still divisible by 2
\[\frac{14/2}{16/2}=\frac{7}{8}\]
now its simplified

Answer 18

ohh okay! That helped me alot!! Thanks!

Answer 19

good luck :)

Answer 20

Thank you so much!