Question

2.
How can you tell when a quadratic equation has two identical, rational solutions? (1 point)

when the radicand is negative
when b in the quadratic formula is greater than the radicand
when the radicand equals zero
when the radicand is not a perfect square

Answer 1

the second one. When B in the formula is greater. No perfect square quadratics can have be smaller than the radicand. I think.

Answer 2

When b^2=4ac the zero is at a single point. The parabola does not penetrate the x axis. This represents two zeros, both with the same value.

Example: x^2+4x+4 yields two zeros, each at x=-2. Notice that b^2=16=4ac

Penetrate = succeed in forcing a way into or through

Parabola = a symmetrical open plane curve formed by the intersection of a cone with a plane parallel to its side. The path of a projectile under the influence of gravity ideally follows a curve of this shape.

Answer 3

so it is b?

Answer 4

Mmmm... I don't know. I would just BUMP this and see if people say B or other answers. Just post this question in the chat.

Answer 5

it has to be b

Answer 6

When the radicand is 0 because, watch this:

Answer 7

\[x=\frac{-b \pm \sqrt{0}}{2a}\]

Answer 8

I think it's C.

Answer 9

Would you agree that -b+0 is the same as -b+0?

Answer 10

yes

Answer 11

So if the radicand is 0, there will only be one answer.

Answer 12

quadratic equation: ax^2+Bx+c=0 is that it???

Answer 13

yes

Answer 14

identical, rational solutions: X1=X2
both \[\in R\]
???

Answer 15

That means the radicand is 0 because the "two roots" are equal.

Answer 16

C it is