If $straight A equals open square brackets table row 1 4 cell negative 1 end cell row 2 6 5 end table close square brackets space and space straight B equals open square brackets table row 3 cell negative 2 end cell cell negative 6 end cell row 2 0 cell negative 7 end cell end table close square brackets$ , find A + B and A - B.

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Solution

straight A equals open square brackets table row 1 4 cell negative 1 end cell row 2 6 5 end table close square brackets comma space space space straight B equals open square brackets table row 3 cell negative 2 end cell cell negative 6 end cell row 2 0 cell negative 7 end cell end table close square brackets therefore space space space straight A plus straight B equals straight A equals open square brackets table row 1 4 cell negative 1 end cell row 2 6 5 end table close square brackets plus open square brackets table row 3 cell negative 2 end cell cell negative 6 end cell row 2 0 cell negative 7 end cell end table close square brackets equals open square brackets table row cell 1 plus 3 end cell cell 4 minus 2 end cell cell negative 1 minus 6 end cell row cell 2 plus 2 end cell cell 6 plus 6 end cell cell 5 minus 7 end cell end table close square brackets space space space space space space space space space space space space space space space space space space space space equals space open square brackets table row 4 2 cell negative 7 end cell row 4 6 cell negative 2 end cell end table close square brackets space space space straight A minus straight B equals straight A equals open square brackets table row 1 4 cell negative 1 end cell row 2 6 5 end table close square brackets minus plus open square brackets table row 3 cell negative 2 end cell cell negative 6 end cell row 2 0 cell negative 7 end cell end table close square brackets equals open square brackets table row cell 1 minus 3 end cell cell 4 plus 2 end cell cell negative 1 plus 6 end cell row cell 2 minus 2 end cell cell 6 minus 0 end cell cell 5 plus 7 end cell end table close square brackets space space space space space space space space space space space space space space space space space space space space space equals space open square brackets table row cell negative 2 end cell 6 5 row 0 6 12 end table close square brackets

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