Other slides in this set

Slide 2

Preview of page 2

Here's a taster:

What is the DISCIMINANT?
The discriminant comes from the quadratic
formula
It is the part under the square root sign
b²-4ac
Known as D…read more

Slide 3

Preview of page 3

Here's a taster:

There are 3 possibilities:
The equation can have three different
outcomes:
TWO REAL ROOTS-cuts the x-axis in two places
ONE REAL ROOT-cuts the x-axis in one place
NO REAL ROOTS-does not cut the x-axis
Now we can look at each of these outcomes
in turn…read more

Slide 4

Preview of page 4

Here's a taster:

TWO REAL ROOTS
With two real roots D>0
In other words b²-4ac>0
Two real roots means the equation:
ax²+bx+c=0 has two solutions
(x1,0)and (x2,0)
The graph cuts the x-axis twice…read more

Slide 5

Preview of page 5

Here's a taster:

Example of two real roots:
The graph of y=4x2 -2x-1 has two real roots
Proven by:
b2 -4ac
(-2)2 ­(4x4x1)=20
20>0 = two real roots…read more

Slide 6

Preview of page 6

Here's a taster:

NO REAL ROOTS…read more

Slide 7

Preview of page 7
Preview of page 7

Slide 8

Preview of page 8
Preview of page 8

Slide 9

Preview of page 9
Preview of page 9

Comments

No comments have yet been made

Similar Mathematics resources:

See all Mathematics resources »See all resources »