SOLUTION: Please help me solve this equation: | x 5 2 | |-6 4 1 | = x^2 + 22x - 1 | 3 1 x | I've tried: (solving the 3x3..) 4x^2+15-12-24-x+30x 4x^2+29x-21 (then equaling that

Algebra ->  Matrices-and-determiminant -> SOLUTION: Please help me solve this equation: | x 5 2 | |-6 4 1 | = x^2 + 22x - 1 | 3 1 x | I've tried: (solving the 3x3..) 4x^2+15-12-24-x+30x 4x^2+29x-21 (then equaling that       Log On


   

Question 366412: Please help me solve this equation:
| x 5 2 |
|-6 4 1 | = x^2 + 22x - 1
| 3 1 x |
I've tried:
(solving the 3x3..)
4x^2+15-12-24-x+30x
4x^2+29x-21
(then equaling that to the right part of the original equation...)
4x^2+29x-21=x^2+22x-1
3x^2+7x-20=0
I don't know know where to go from there to solve for x.
Answer by solver91311(24713) About Me  (Show Source):
You can put this solution on YOUR website!


Just like any other quadratic. You either factor it or use the quadratic formula. This one factors:




John

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