# math calculus

posted by .

7/(x-2)(x+5)-8/(x+5)(x-3)

7(x-3)-8(x-2)/(x-2)(x+5)(x-3)

7x-21-8x+16/(x-2)(x+5)(x-3)

7x-8x give me -1x and -21+16 give me -5. for numerator but it have to be -1/(x-2)(x-3)

i not know how to do this please explain process my way not different way.

• math calculus -

You have to use brackets to show that both
x-2 and x+5 are factors of the bottom, so ...
7/((x-2)(x+5)) - 8/((x+5)(x-3)

so the lowest common denominator is (x-2)(x+5)(x-3)
we get
[ 7(x-3) - 8(x-2) ] /[(x-2)(x+5)(x-3)]
= [7x - 21 - 8x + 16]/[(x-2)(x+5)(x-3)]
= (-x - 5)/[(x-2)(x+5)(x-3)]
= -1(x+5)/[(x-2)(x+5)(x-3)]
= -1/[(x-2)(x-3)]

• math calculus -

= (-x - 5)/[(x-2)(x+5)(x-3)]
i understand how u do this part

= -1(x+5)/[(x-2)(x+5)(x-3)]
i not understand how you get numerator

• math calculus -

I simply factored out a -1

• math calculus -

sorry but that the only thing i don't understand how do u factor that out? could you please explains slowly

• math calculus -

2x + 4
then it would be 2(x+2)

-2x - 4
then it would be -2(x+2)

then it would be -1(x+5)

in each case, expand my answer and see what you get.

• math calculus -

thank you very much reiny for taking time to explain :) u took all confusion away :)

## Similar Questions

identitfy two methods that have been used by interest groups to influence the appointment process. explain how much of these methods has been used to influence that process i looked on google and there was information but it didn't …
2. ### bussiness management

For this discussion use the Critical Thinking Process to analyze the problem-solving the individuals may apply in the case study, "Elective Surgery Department Faces Decreased Patient Satisfaction." Share your chosen role and your role's …
3. ### Calculus--Reiny

Calculus - Reiny, Friday, December 23, 2011 at 6:59pm I read that as (4a^2-1)/(4a^2-16) * (2-a)/(2a-1) , my brackets are necessary = (2a+1)(2a-1)/( 4(a+2)(a-2) * (2-a)/(2a-1) the (2-a)/(a-2) are opposite, they will give you the -1 …
4. ### Mat/117 DQ1

How do you know if a quadratic equation will have one, two, or no solutions?

A.give an example of a function whose domain is {3,4,7,9}?

I have absolutely NO IDEA how to solve this problem!!?
7. ### Math Help

could someone please give me an example not an example using coins, marbles, spinner, like something different that would explain the difference b/w theoretical and experimental probability. And please explain.
8. ### Math

give 2 examples of mixed numbers that when multiplied by 3/4 give a product between 3/4 and 1. my mom knows what numbers to use but isn't sure how to explain to me how to calculate them. Can you explain to me the way to calculate the …
9. ### Science

2.Why are biologists concerned about ecosystem disruption?
10. ### math

the sex of to domain species is unknown but they each have a probability of X and -5 what does x equal and what is the domain species?

More Similar Questions