Matematică
30martie
2015-11-04 04:22:09
Determinati nr reale x si y,stiind ca A+2B=I2,unde I2=(1 0 0 1) Matricea A=( 1 2 4 1) si B( 0 x y 0)
Răspunsuri la întrebare
johnyjon96
2015-11-04 09:19:07

[latex]left[egin{array}{cc}1&2\4&1end{array} ight] +2* left[egin{array}{ccc}0&x\y&0end{array} ight] = left[egin{array}{ccc}1&0\0&1end{array} ight] [/latex] [latex]left[egin{array}{cc}1&2\4&1end{array} ight] + left[egin{array}{ccc}0&2x\2y&0end{array} ight] = left[egin{array}{ccc}1&0\0&1end{array} ight] [/latex] [latex]left[egin{array}{cc}1&2+2x\4+2y&1end{array} ight] = left[egin{array}{ccc}1&0\0&1end{array} ight] [/latex] [latex]2+2x=0 = extgreater x=-1[/latex] [latex]4+2y=0= extgreater y=-2[/latex]

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