Question

x2 - 4x + 4 = 0
double root
real and rational root
real and irrational root
imaginary root

Answer 1

Double Root

Answer 2

how do you know, thats what im confused about

Answer 3

(x - 2)(x - 2)
You can also use the discriminant.
b^2 - 4ac
16 - 4(4)
16 - 16
0
Since it's 0, it's a double root.

Answer 4

oh ok

Answer 5

it crosses in one place,
x=2 x=2
we call this a double root