Question

What is the equation of this graph? pic.twitter.com/vQQqDhDu

Answer 1

I see the graph. What is written in red?

Answer 2

Here's a hot link: http://twitter.com/sabzz13/status/249678448082169856/photo/1

Answer 3

ignore the red, sorry

Answer 4

Give the x=intercepts - read from graph.

Answer 5

x intercepts: -1, 1, 3.. sorry better picture attached

Answer 6

Okay. That means that three factors of the equation of the graph are (x- (-1)) = (x +1) and (x-1) and (x-3). Agree?
@sabika13

Answer 7

If x = 3 is an x intercept, that means x-3) is a factor.

Answer 8

Look on the graph. Do you see that the graph is tangent to the x-intercept -1 ? Please answer.

Answer 9

here look at what I thought was right, my teacher marked it accordingly.. He marked x-3 wrong. pic.twitter.com/jWBKHt08 .. he wrote something in red also, but i dont understand it.

Answer 10

Did you write the equation as the following on that paper:

y = - (x + 1)^2 (x-1)^3 (x - 3) ?

Answer 11

i did not put the - sign in the front, but i do agree that it should be there.. other then that yes..

Answer 12

The negative sign should be there but here is what your teacher really marked wrong. See attached file.

Answer 13

Why did you cube the (x-1) factor. Just wondering.

Answer 14

Look at this graph: http://www.wolframalpha.com/input/?i=y+%3D+-+%28x+%2B+1%29%5E2+%28x-1%29+%28x+-+3%29+

Answer 15

the degree of x=1 is 3.. its the way the line is going.. like for example for x=3 the line is going straight so the degree is 1.. (something i learned in grade 12).. he marked (x-1)^3 correct.. he marked (x-3) wrong..

Answer 16

I see a root of even multiplicity where the graph is tangent to the x-axis at x = -1.

Answer 17

I get something like -(x+1)*(x^2-1)*(x-3), which I think is same as Directrix's answer.