Question

Calculate the discriminant.

x2 – 2x + 4 = 0

A.
20

B.
0

C.
12

D.
–12

Answer 1

a = 1, b = -2, and c= 4

The discrminant is b^2 - 4ac.

Compute b^2 - 4ac using the values of a,b, and c.

Answer 2

So

Answer 3

can you evaluate b^2 - 4ac when a = 1, b = -2, and c = 4?

Answer 4

i got -20

Answer 5

and there is no -20

Answer 6

(-2)^2 - 4(1)(4)
= 4 - 16
= -12

Answer 7

oh

Answer 8

You added 4 to 16 to get 20. Why you did that, beats me! But at least you now understand why it is -12.