Question

PLEASE SOMEONE HELP ME AND I WILL GIVE MEDAL AND BE SOOO GREATFUL!

1.Use the quadratic equation y=x^2+3x+9
Where does the parabola lie?
A) below the x- axis
B) above the x-axis
C) on the x-axis
D) on the y-axis

2. Use the quadratic equation y=x^2-6x+9
Calculate the discriminate to determine the number of real roots.
A) one real root
B) two real roots
C) no real roots
D) no solution to the equation

Answer 1

two real roots

Here Discriminant = 0
therefore there are 2 equal and real roots

Answer 2

If the x^2 term of a quadratic is +ve then the parabola is u shaped (and has a minimum point)
If the x^2 is -ve then it is inverted u shaped and has a maximum point

Answer 3

By `quadratic equation` do you mean `quadratic formula` ?

Answer 4

1. B, 2.A

Answer 5

the max or min Y value is given by

m = c-(b^2/4a)

Use these to find if the curve is above or below the x axis

Answer 6

@SolomonZelman
No - there is a quadratic EQUATION in the question

Answer 7

Yeah it's quadratic equation. And thank you everyone for helping!

Answer 8

For no 2

the discriminant is given by b^2-4ac

If this is positive there are 2 real roots
If 0 then 1 real root
If -ve then 2 complex roots

Answer 9

Wait so which one is it @MrNood

Answer 10

so calculate the discriminant from the formula I gave you.

Also please be careful of answers given here - I have seen many incorrect answers given. You should check before entering any into a test

Answer 11

Is 1 B and 2 A?

Answer 12

1.B and 2.B
D=0 in case of 2nd question implying 2 real equal roots....

Answer 13

Those are the answers given by other users - did you check them?

Answer 14

No xc

Answer 15

And now you have a conflict of answers from other users.

I gave you the formulae needed for both questions......

Answer 16

Lol we'll I believe that @princeharryyy is right xp

Answer 17

I wouldn't

Answer 18

How come

Answer 19

I'm going to close this question because I need some help with some others

Answer 20

But I still need help with these please? :) I wish I could give you guys like 100 medals hahaha

Answer 21

Didn't even call me : P

Answer 22

Sorry hahah you seem to be busy lately :p

Answer 23

yeah thats true well i am not that much now : P

Answer 24

Lol we'll can you help me then :)