Question

What is the discriminant of

qx^2 + rx + s = 0?

a. the absolute value of a+b
b. q^2-4rs
c. r^2-4qs
d. s^2-4qr​

Answer 1

c. r^2 -4qs

Explanation:

When compared to the standard quadratic ...

ax^2 +bx +c = 0

we find that your quadratic has ...

a = q, b = r, c = s

Substituting these into the formula for the discriminant, we get ...

d = b^2 -4ac = r^2 -4qs

The discriminant is r^2 -4qs.