Question

5v^2+31v-28 how do you factor?

Answer 1

7

Answer 2

@antonio_xx2 could you show me how to do it?

Answer 3

You need to find two numbers that when multiplied give 28 and when added give 31.

Answer 4

what about the five?

Answer 5

what numbers even factor out like tht?

Answer 6

With numbers like these I would suggest to just solve it with the quadratic fomula.

Answer 7

right, thts what im doing right now

Answer 8

but which numbers do tht?

Answer 9

See what 2 results it gives you, and then put their opposites in this form:
\[(v \pm x)(v \pm x)\]
(where x are the results you find)

Answer 10

what is tht?

Answer 11

What did the quadratic formula yield?

Answer 12

i dont know how to do tht

Answer 13

\[x = \frac{ -b \pm \sqrt{b^2-4 \times a \times c} }{ 2 \times a }\]

Answer 14

In your case a = 5, b = 31, c = -28

Answer 15

im not doing it tht way for school, i dont even know where you're goin with tht

Answer 16

Did you do similar exercises?

Answer 17

On other equations?

Answer 18

well for r^2-r-6 i got r=2 r=-3

Answer 19

Do this: x^2+15x+50

Answer 20

x=10 x=5

Answer 21

It's supposed to be easy on equations like this, but the one you gave at the beginning is only possible by someone with a relatively high maths skill.

Answer 22

well my math teacher gave them too me and taught us how to do them, but its some asktik thing but it's really confusing

Answer 23

Which is why I suggested using the quadratic formula, it's sort of the last resort if you can't find two numbers.

Answer 24

Go above, and plug in the numbers for me, tell me what you get.

Answer 25

oh ok then, let me copy tht down on my paper

Answer 26

what does tht funky plus sign mean?

Answer 27

It means do one time plus, and on another a minus.

Answer 28

Which also means you will get two answers.

Answer 29

what

Answer 30

did you reach -31plusminus39 / 10 ?

Answer 31

i dont know how to use tht sign