Question

Help please xx

Answer 1

c positive just learned this yesyerday

Answer 2

*yesterday

Answer 3

can i get my medal plz

Answer 4

@mathmale

Answer 5

Hello, zarkam,

Do you know what the "discriminant is," when you're discussing a quadratic equation?

You most likely know the quadratic formula. The "discriminant" is the expression

Answer 6

Well I do know that if there is a positive discriminant there are two real number solutions

Answer 7

\[b^2-4ac\]

There are 3 cases, zarkam.

1) if the discrim. is positive, your equation has 2 real, different roots.
2) if the discrim. is zero, your equation has 2 real, equal roots.
3) if the discrim. is negative, your equation has either imaginary or complex roots.
Are you familiar with this terminology?

Answer 8

Thank you for sharing "Well I do know that if there is a positive discriminant there are two real number solutions." That's correct. Very good.

Note that if your quadratic equation has real roots, they show up as x-intercepts.
Now look at the given graph. Do you see any x-intercepts? In other words, does the graph cross the x-axis anywhere?

Answer 9

No it does not

Answer 10

that means that the roots of the quadratic in question are either imaginary or complex.

Answer 11

So 0?

Answer 12

@mathmale

Answer 13

@zarkam21 : Which of the following do you observe here?

1) if the discrim. is positive, your equation has 2 real, different roots.
2) if the discrim. is zero, your equation has 2 real, equal roots.
3) if the discrim. is negative, your equation has either imaginary or complex roots.

You asked whether "0" was correct. Do you see 2 different, real roots in the diagram? If not, then "0" is not the correct answer.

Answer 14

Oh okay so D. because the roots are either imaginary or complex =)
Thanks @mathmate for helping =)

Answer 15

Yes, that's correct. My pleasure.