Question

How do you find the determinant of `|(8,9,3), (3,5,7), (-1,2,4)|`?

Answer 1

`|(8,9,3),(3,5,7),(-1,2,4)|=-90`

Explanation:

`|(8,9,3),(3,5,7),(-1,2,4)|=8|(5,7),(2,4)|-9|(3,7),(-1,4)|+3|(3,5),(-1,2)|=`

`8(5*4-7*2)-9(3*4+1*7)+3(3*2+1*5)=`

`8*6-9*19+3*11=48-171+33=-90`