The Quadratic Formula Flashcards
1
Q
Quadratic formula=
A
X = -b+-#/b2-4ac % 2a
%=divides by #/=square root
2
Q
The discriminant is
A
b2 - 4ac
The bit in the square root of the quadratic equation.
3
Q
Two real roots:
A
b2 -4ac > 0
The graph crosses x axis twice. And these values are the roots
4
Q
One real root
A
b2-4ac = 0
The graph just touches the x axis from above or from bellow.
5
Q
No real roots
A
The graph doesn’t touch the x axis at all.
B2-4ac < 0
6
Q
Finding the discriminant and roots when a b c are unknown.
A
You’ll end up with an equation or an inequality for the discriminant in terms of the unknown you might have to find the value of range of value of the unknown.
Discriminant against > = < 0
For range of values
