### 13 terms by tzeif_21

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y=ax^2+bx+c

y=a(x-p)(x-q)

y=a(x-h)^2+v

vertex= (h,v)

### How can you solve from vertex form?

Completing the square

Factoring

### How can you solve from standard form?

*when 0=ax^2+bx+c

### discriminant=

b^2-4ac (what's under the root)

### How to find the x-coordinate of vertex:

from standard: -b/2a
from factored: (p-q)/2

### the discriminant is used in order to find...

how many x-ints there are

+ discriminant=2 x-ints
- discriminant= 0 x-ints
when discriminant=0, there is one x-int, which is also the vertex

*b/c you can't sq root a negative number, and root 0 is 0, but root any positive number will have both a positive and negative root

### How can one identify a quadratic formula?

The second difference: after finding the difference between each term, find the difference between those differences. If that value is a constant number, then we have the second difference, and the formula is quadratic.

### We can find a by...

finding the second difference/ 2

2a=second difference

### We know c because...

it's the y intercept (when x is 0)

### We can find b by...

once we a & c, we can plug in for x & y with known points, and solve for b

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