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I think it was like crossing across and down and then add all of them??????

i think... but i wasn't sure.

so could anybody explain how to do matrix with hands?

also, is this problem solvable without a calculator?

find all values of x that make l 2 -1 4 l

l 3 0 5 l = l x 4 l

l 4 1 6 l l 5 x l

and the answer is + or- 4.47

thank you for reading my questions!~><