X2 4x 5 x2 6x 16 x2 x 30 x2 x 30 x2 2x 80 x2 2x 80 82585

Name: x2 4x 5 x2 6x 16 x2 x 30 x2 x 30 x2 2x 80 x2 2x 80 82585
Uploaded: 2021-05-17T21:46:48-08:00
Duration: 4 min 7 s
Channel: Erika Bustos
Description: x2 4x 5 x2 6x 16 x2 x 30 x2 x 30 x2 2x 80 x2 2x 80 82585

Transcript

00:01 We need to solve the following for x, and in order to do that, we need to factor.

00:04 So our first one, we have two parentheses.

00:08 One's going to be plus, one's going to be minus, so x squared breaks up into x and x.

00:13 Six, we've got six and one, two, and three, and the only way we subtract those to get five is to have a two and a three.

00:20 Oh, no, sorry, a five and a six and a one.

00:23 So we have minus six plus one equals zero.

00:27 So then we set each of the parentheses equal to zero, so x, x, minus 6 equals 0, and x plus 1 equals 0.

00:35 So from our first one, we get x equals positive 6, when we move the x, the 6 over.

00:41 And for our second one, we get negative 1.

00:43 So those are our two answers when we solve for x for letter a.

00:48 So letter b, we do the same thing.

00:50 We factor.

00:54 So we got x and x.

00:56 12, we're going to subtract the factors of 12, and the only ones to subtract to give you a 4 are 6 and 2.

01:03 So we have a positive 6 and a minus 2.

01:06 We set each parentheses equal to 0, so x plus 6 is equal to 0, x minus 2 is equal to 0.

01:13 So we move the 6 over, so we get x is equal to negative 6 for one answer, and we get x equals positive 2 as an x answer.

01:21 For letter c, we got 15, so we factor it's positive 15, so that means we're going to have to add.

01:29 The only two numbers that multiply to give you 15 that add to 8 are 3.

01:34 And five.

01:35 They both have to be minus.

01:37 So we set each parentheses is equal to zero.

01:40 So x minus three is equal to zero.

01:42 X minus five is equal to zero.

01:45 When we move the three over, it x becomes a positive three.

01:49 And when we move the five over, it becomes positive five.

01:52 So those are to the two answers for letter c.

01:56 Letter d, we factor.

02:00 So we've got x and x...

Question

$x^2 + 4x - 5$ $x^2 + 6x - 16$ $x^2 + x - 30$ $x^2 - x - 30$ $x^2 + 2x - 80$ $x^2 - 2x - 80$

Question

$x^2 + 4x - 5$ $x^2 + 6x - 16$ $x^2 + x - 30$ $x^2 - x - 30$ $x^2 + 2x - 80$ $x^2 - 2x - 80$

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