Math
posted by Jon .
Evaluate:12 5 2
3 0 1
5 4 2
It's going to be really confusing if I post my work. I got 127 from all the confusing things I did

12 5 2
3 0 1
5 4 2
Expand the determinant along the second row:
3 times det of
5 2
4 2
= 3* 18 = 54
1 times det of
12 5
5 4
= 73
54  73 = 19
Respond to this Question
Similar Questions

math
how are and 3 4th bours and the distance traveled in 2 3 4th hours represented in the table? 
Easy (yet confusing) Algebra
These problems are pretty easy, but confusing (as stated in the subject line). 2x+5x=10 3x+42x=11 I know there are supposed to be two answers for each problem, for the first problem I got 5 and for the second problem I got 7. … 
maths
I have an illustration in my book of a quadrilateral inside a circle. The quadrilateral is ABCD; AB is a vertical line and then AC and BD are the same length, but AC slopesd downward and BD upwards. Finally, there's CD; it's not vertical, … 
Math  Working with Logs!!
On September 26 2001, an earthquake in North Bay measured 5.0 on the Ritcher scale. What is the magnitude of an earthquake 3 times as intense as North Bay's earthquake? 
log
please help given that 4^(2x+1) X 7^(x1) = 8^x X 14^2x evaluate 14^x this is what i did, but i got stuck anyways. 2^(4x+2) X 7^(x1) = 2^3x X 14^2x 2^(x+2) = 2^2x X 7^(x+1) sorry this might be a bit confusing, but the big letter X … 
Calculus
I'm studying infinite series and am really struggling with memorizing all the tests for convergence in my book, there's like 10 of them. I don't think I'm going to be successful in memorizing all of them. I will never be asked in my … 
Math !!!!!!!!
Ok i have a Summer Math Assignment & i really need help on this qs. it's part B of the qs. so i'll show you the whole thing Part 2. Extended Reponse Qs. (2 points each) Answer each qs.. Show all Work Qs. 5 Adrian correctly solved two … 
College Math
Another question which is confusing. The position of an object moving in a straight line is give by s=2t^23t, where is s in metres and t is the time in seconds the object has been in motion.. how long will it is take the object to … 
math
A and B can do a piece of work in 12 days. They started to work together but A left after a few days. If B alone worked for 20 days, the whole work was finished in 24 days. How long would A take to complete the work? 
Algebra 1
List all of the subsets of the following set: {2, 2} A.) {2};{2};{2,2} B.) {};{2};{2};{2,2};{2,2} C.) {};{2};{2};{2,2} D.) {};{2};{2};{2,2};{2,2} I think it's B, but I'm not 100% on that. This topic of sets is really confusing …