# If triangle is less than zero then theree (1 Viewer)

#### Hivaclibtibcharkwa

##### Well-Known Member

In the ie. part they set triangle to Less than zero

#### CM_Tutor

##### Moderator
Moderator
The triangle is the discriminant of the quadratic equation, the $\bg_white \Delta = B^2 - 4AC$ from the quadratic formula.

$\bg_white \text{If}\ \Delta < 0\ \text{then the quadratic equation has no real roots, and so is either always positive (if A > 0) or always negative (if A < 0).}$

#### Hivaclibtibcharkwa

##### Well-Known Member
The triangle is the discriminant of the quadratic equation, the $\bg_white \Delta = B^2 - 4AC$ from the quadratic formula.

$\bg_white \text{If}\ \Delta < 0\ \text{then the quadratic equation has no real roots, and so is either always positive (if A > 0) or always negative (if A < 0).}$
Oh right so it can’t equal to anything. Right? Since no real roots

#### CM_Tutor

##### Moderator
Moderator
If no real roots, the discriminant must be negative. It has to have some value.