Tutor.com Quadratic Equations Session

Jun. 12, 2012

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Session Transcript - Math - Algebra, 6/6/2012 7:11PM - Tutor.comSession Date: 6/6/2012 7:11PM
Length: 12 minute(s)
Subject: Math - Algebra


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Guest (Customer)
[00:00:00] Approximate the zeros of the function. f(x)=x squared + 5x + 1

Constance G (Tutor)
[00:00:07] Welcome to Tutor.com ! Let's get started.
[00:00:08] hi

Guest (Customer)
[00:00:12] hi!

Constance G (Tutor)
[00:00:26] How do you find the zeros of a quadratic?

Guest (Customer)
[00:00:47] use the equation for axis of symmetry?

Constance G (Tutor)
[00:01:06] that would help us if we were graphing.
[00:01:15] How can we do it without graphing?

Guest (Customer)
[00:01:33] you could factor it, but that wouldn't work in this case..

Constance G (Tutor)
[00:01:52] you are correct, it won't work in this case but it is a method

Guest (Customer)
[00:02:05] we can use the quadratic

Constance G (Tutor)
[00:02:13] good
[00:02:27] when factoring doesn't work that is always a good choice

Guest (Customer)
[00:02:49] but if the question says "approximate" do i still want to use the quadratic?

Constance G (Tutor)
[00:03:31] yes because approximate suggests a value that has been rounded, like when you take a square root. If you factor you can get an exact answer.

Guest (Customer)
[00:03:38] ok
[00:04:22] so the quadratic is x=-b squared +/- the square root of b squared -4ac all over 2a, correct?

Constance G (Tutor)
[00:04:43] the first b is not squared

Guest (Customer)
[00:04:46] oh ok
[00:05:00] perfect, thank you

Constance G (Tutor)
[00:05:28] go ahead and get the numbers in and see what happens.

Guest (Customer)
[00:05:29] ok

Constance G (Tutor)
[00:06:15] keep going you are doing fine
[00:06:45] don't forget the -5 is also over the 2
[00:06:56] right

Guest (Customer)
[00:07:10] then do i set one of them to positive and one to negative?

Constance G (Tutor)
[00:07:17] yes

Guest (Customer)
[00:07:56] isn't that as far as i can go for the one on the right?

Constance G (Tutor)
[00:08:18] until you use a calculator to find the square root yes.
[00:09:10] good
[00:09:33] almost done with that one
[00:08:32] You got it!
[00:09:46] now for the other answer
[00:09:56] You got it!
[00:11:10] great job

Guest (Customer)
[00:11:12] thanks for your help!

Constance G (Tutor)
[00:11:29] you did all the work I just helped along the way

Guest (Customer)
[00:11:37] i appreciate it, thanks again

Constance G (Tutor)
[00:11:45] my pleasure
[00:11:50] Thanks for using Tutor.com. Please fill out the survey as you leave so we can learn how we can better help you in the future! 
[00:11:55] have a good evening

Guest (Customer)
[00:11:57] you too! goodbye

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