Question

http://prntscr.com/ayrwg8

Answer 1

Discriminant:
\(D = b^2 - 4ac\)

Answer 2

if you notice, this is basically a portion of the quadratic formula :)

Answer 3

It's 12, right?

Answer 4

let me check

Answer 5

2^2 - 4(1)(-2)
4 - 4(1)(-2)
4 + 8
12

yes you're correct :)

Answer 6

Thanks cx

Answer 7

yw :)