A community for students.
Here's the question you clicked on:
 0 viewing
anonymous
 5 years ago
Simply the equation Please help me :)
3
_____
4+√5
anonymous
 5 years ago
Simply the equation Please help me :) 3 _____ 4+√5

This Question is Closed

shadowfiend
 5 years ago
Best ResponseYou've already chosen the best response.1The best way to simplify these is to multiply the top and bottom by the denominator (that will get rid of the square root).

shadowfiend
 5 years ago
Best ResponseYou've already chosen the best response.1So you would do: \[\frac{3(4 + \sqrt{5})}{(4 + \sqrt{5})(4 + \sqrt{5})}\]

shadowfiend
 5 years ago
Best ResponseYou've already chosen the best response.1... Do what? The above is what you do. You have to multiply it out.

shadowfiend
 5 years ago
Best ResponseYou've already chosen the best response.1... By multiplying?

shadowfiend
 5 years ago
Best ResponseYou've already chosen the best response.1For example, \(3(4 + \sqrt{5})\) = \(3\times 4 + 3\times \sqrt{5}\).

shadowfiend
 5 years ago
Best ResponseYou've already chosen the best response.1You can leave \(3\times \sqrt{5}\) as just \(3\sqrt{5}\).

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0and can you stop deleting my post :/

shadowfiend
 5 years ago
Best ResponseYou've already chosen the best response.1No. You are already getting helped here. Please do not repost a question that you are already receiving help on. If you do repost a question that *hasn't been answered* and you aren't receiving help on, please delete your original question.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0okay i only did that b/c i don't understand what your talking about !

shadowfiend
 5 years ago
Best ResponseYou've already chosen the best response.1Ok, that's fine. We'll try and fix that. In an equation like the one you posted, `simplifying' involves removing square roots from the denominator.

shadowfiend
 5 years ago
Best ResponseYou've already chosen the best response.1To do that, we have to multiply the denominator by its conjugate (the same thing, but minus the square root instead of plus the square root), which will get rid of the square root. But, if we just do that in the denominator, we've changed the value of the entire equation. So, we multiply *both* the top *and* the bottom by the same thing, which is the same thing as multiplying by 1  i.e., it doesn't change the overall value.

shadowfiend
 5 years ago
Best ResponseYou've already chosen the best response.1For example, if I have 3/5 and I multiply by 10/10, I have 30/50. But that's the same thing as 3/5, it's just written differently.
Ask your own question
Sign UpFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.