Maths entrance questions on matrices and determinants |EUEE 2008

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Entrance questions on matrices, euee maths,
Maths entrance exam questions on matrices and determinants, grade 11 unit 6, grade 11 maths, grade 11, entranceexam, ethiopian education, university entrance exam, maths questions, matrices and determinants
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on the first question the asked is (AB^-1)but you worked on (BA^-1)
so they cannot give us the same answer the correct answer is[ (-3 11
1 -3) ] if im wrong correct me please
but i want to say thanks for your support

kiyadiriba
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1st quation lay check adrgew mabazatu lay shtet ale

mahiyemi
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On the first question the asked is (AB)^-1 BUT YOU go through( BA)^-1BUT the out came is not the same according to the question the correct answer is (-3 11
1 -3)
On question no 2 i have a question
We follow the cramers rule to solve so X=Dx/detA=6 and Y=Dy/detA=-2 in the same case Z=Dz/detA=4 so how can the value of z=-8
But for your support its my pleasure if i say thanks

kuletdiriba