What is the discriminant of the polynomial below?

2 х2 + 4x - 9

А. 88

в. 22

с. - 56

D. - 2

Let d = discriminant

d = b^2 - 4ac

Let a = 2, b = 4 and c = - 9

We now plug and chug.

d = (4) ^2 - 4 (2) (-9)

d = 16 - 8 (-9)

d = 16 + 72

d = 88

А. 88

Step-by-step explanation:

2 х^2 + 4x - 9

This is in the form

ax^2 + bx + c

where a=2 b=4 and c=-9

The discriminant is

b^2 - 4ac

Substituting into the equation

4^2 - 4 (2) (-9)

16 - (-72)

16+72

88