Question

|-2 2 4 |
|-1 5-5|
|4 -3 1 |
evaluate the determinant
I got -6

Answer 1

i got -86

Answer 2

ok, well both are options. I must have done my addition wrong

Answer 3

show what u done ?

Answer 4

I evaluated -10+(-40)+12-80-(-30)-(-2)

Answer 5

first term
-2 (5-15) = ... ?

Answer 6

ok... I got -86 that time also haha

Answer 7

-25?

Answer 8

u got -86...thats correct...

Answer 9

oh, I think I misunderstood your question though, on the first term (-2)(5)(1) I got -10

Answer 10

but it should be +10

Answer 11

+20

Answer 12

-2, 5 and 1? how would that be positive?

Answer 13

ohh..that way
then
-2(5*1) = -10
then
-2(-(-5)(-3)) = +30
and -10+30 = 20
thats how i got +20

Answer 14

oh, gotcha.

Answer 15

do you work it differently then?

Answer 16

lil bit...i solve it having 3 terms, instead of 6....basically same thing.

Answer 17

oh ok, thats cool. I'd ask how, but I'm not looking to impress anyone, just making sure I got the right answer haha. I appreciate the assistance though.

Answer 18

welcome ^_^