Question

4. What is the possible discriminant of the graph?

a parabola opening up with vertex near negative 1.2 comma negative 9.1. a y intercept of negative 6

-11
zero
25
73

5. What is the possible discriminant of the graph?

a parabola opening up x intercepts near negative 7 and negative 3

-13
zero
15
16

Answer 1

@kohai

Answer 2

So they've given you two points here
(1.2, 9.1)
You need to get the equation for this, and solve for y.
After that, you can use the discriminant formula

Answer 3

ok would the first one be 73?

Answer 4

Let me check it

Answer 5

kk

Answer 6

*sigh* This is going to take me a moment. To speed things up, have you already made your equation for the first problem?

Answer 7

oh it's ok. I can wait, but I am not sure if i am right, just wanted to check with u

Answer 8

Alright, give me a bit to check then

Answer 9

kk

Answer 10

Would you mind telling me the vertex for the first problem?

Answer 11

near -1.2

Answer 12

Ok, this is the equation for the line that I got, the work I did to get it, and the resulting graph that looks pretty much what you gave above

y=0.4(x+1.2)^2-9.1

Answer 13

i don't understand how to find the discriminant of the graph

Answer 14

I'm working on it, but you need the equation to do it

Answer 15

Oh. I see. So, this is in vertex form right now, we need to get it to standard form.

y=ax^2+bx+c

Can you find it in standard form?

Answer 16

umm..

Answer 17

i am confused

Answer 18

Alright. I'm going to finish this and then briefly explain, because I need to leave soon

Answer 19

thx

Answer 20

Ok. So, it was easiest to put this in vertex from, like I did above. Then you convert it to standard form.

Now, the formula for the discriminant is
Dis=b^2−4ab
Where,
a=0.4
b=0.96
c=-8.524

Answer 21

So plugging it in, it'll look like this. The discriminant is 14.99999ish so it'll round to 15

Answer 22

put the answer choices are
-11
zero
25
73

Answer 23

I'm reworking the problem really fast, I won't have time to help you with the second one but it'll be the same process

Answer 24

thx

Answer 25

Ok, honestly I'm not sure what I'm doing wrong. I just reworked the problem using (-1, -9) and I'm getting a similar answer. The basic process is that you need to put this into vertex form, convert to standard form, and then use the discriminant formula, from what I understand.

Sorry I'm not able to help you.

Try asking some other people to help you, maybe they'll find what I did wrong.

Answer 26

ok thxx!! :)

Answer 27

Good luck :)