Question

Which equation could be solved using the graph above?
A. x^2+4x+3=0
B. x^2-4x+3=0
C. x^2-6x+9=0
D. x^2-1=0

Answer 1

https://www.connexus.com/content/media/913045-5282013-43328-PM-1018858029.jpg

Answer 2

@Agent47

Answer 3

Can you screen shot the graph?
You have to sign in to get to the link you posted.

Answer 4

how do you screen shot it

Answer 5

Are you on a mac or pc?

Answer 6

pc

Answer 7

Go to Snipping Tool

Answer 8

And where is that?

Answer 9

Go to Start, Programs... look there or possibly utitlities

Answer 10

I would look at your graph and find what is its y value when x is 0 ?

Answer 11

I would also look for its x value at the vertex (where it "bottoms out")

Answer 12

@sleepyjess

Answer 13

roots are x=-1,-3
vertex (-2,-5)
(x-(-1))(x-(-3))

Answer 14

ok

Answer 15

hint : when all the roots are negative ---->all the coefficient are positive (or all negative)

Answer 16

amood has the best way to do this. You could multiply out
(x+1)(x+3)
and see which answer matches that

Answer 17

ok but im having trouble understanding

Answer 18

First, can you multiply out
(x+1)(x+3)
?

Answer 19

no you guys are telling me different things I struggle with math and just need someone to tell me how to do this in the easiest way possible

Answer 20

@Agent47 What do you think

Answer 21

They're both right, only using different approaches. I find phi's approach easier.
You know the two x interceptions:
(-3, 0) and (-1, 0)
So when x=-3, y=0; and when x=-1, y=0.