Question

What are the excluded value(s)?

https://media.glynlyon.com/g_alg01_2012/10/9r1.gif



-2, 3

-1, 6

-2, -6


@phi how would i go about this one

Answer 1

there are few things we don't do in math. one is *no divide by 0*
so we exclude anything that might cause a divide by 0

Answer 2

but how is there only one v and two numbers ??

Answer 3

that means you want to exclude any v values that cause the bottom to be 0
you can solve this by setting the bottom = 0 and solve for all the values that cause the equation to be 0. Those will be the excluded values.

Answer 4

can bouth those numbers be plugged in and it equals the smae thing ??

Answer 5

same

Answer 6

Yes, you can test the answer choices. But you should be able to solve a quadratic.

A quadratic is a parabola ( U shaped curve)
it can it the x-axis (where y=0) twice... so 2 answers.

Answer 7

can so how do i solve this then ??

Answer 8

Here is what it looks like, as a graph

Answer 9

ok am i finding these points on it

Answer 10

if i am is it a ??

Answer 11

yes. you can check. Test v= -2
-2*-2 - (-2) -6
4 + 2 - 6
6-6
0
yes , that make the bottom 0. So we must exclude.
I am sure 3 works also

Answer 12

To learn one way to solve this, see Sal's video
http://www.khanacademy.org/math/algebra/quadratics/quadratic_odds_ends/v/solving-a-quadratic-by-factoring

Answer 13

okok thanks

Answer 14

ooooooooooooooo i love khan acedemy