Quadratics Flashcards
1
Q
Quadratic formula
A
-b+- root(b2-4ac)/2a
2
Q
Two real roots
A
b2 - 4ac > 0
3
Q
One real root
A
b2 - 4ac = 0
4
Q
No real roots
A
b2 - 4ac < 0
5
Q
Shape
A
a = positive
graph u shaped
a = negative
graph is n shaped
6
Q
Y intercept
A
Substitute x=0 into equation
7
Q
X intercept
A
Substitute y=0 into equation and solve
8
Q
Vertex
A
Complete the square
9
Q
Finding where lines intersect
A
Solve simultaneous equations
10
Q
Co ordinates of the vertex
A
y = a(x-b)2 + c
11
Q
Value of the x intercepts
A
y = a(x-b)(x-c)
12
Q
Don’t know the vertex or x intercepts
A
y = ax2 - bx + c
