Question

how to find the discriminant of \[\large \left[\begin{array}{ccc} a & b & c \\ d & e & f \\ g& h & i \end{array} \right]\]

Answer 1

do you guys see the latex? idk why i cant see it :/

Answer 2

do you the determinant ?

Answer 3

oh lol yeah

Answer 4

sorry

Answer 5

ok there are a few ways to do this

Answer 6

theres the "proper" method; and then theres the quicker method ... like Unkle just alluded to :)

Answer 7

i use a machine as this is strictly donkey work

Answer 8

... and then theres satellites cheating method ;)

Answer 9

i like the 'proper' method better

Answer 10

but i always make mistakes

Answer 11

the quicker method is to copy the first 2 columns onto the end; then multiply across the diagonals

Answer 12

top is opposite signed tho

Answer 13

is this a proper method...