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121.

Solve space the space matrix space equation space open square brackets table row straight x 1 end table close square brackets space open square brackets table row 1 0 row cell negative 2 end cell cell negative 3 end cell end table close square brackets space open parentheses table row straight x row 5 end table close parentheses equals 0

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122. Find the value of x which makes the following product equal to I :

open square brackets table row 2 0 7 row 0 1 0 row 1 2 1 end table close square brackets space open square brackets table row cell negative x end cell cell negative 14 end cell cell 7 x end cell row 0 1 0 row x cell 4 x end cell cell negative 2 x end cell end table close square brackets

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123.

Find space straight x space such space that open square brackets table row 1 2 1 end table close square brackets space space open square brackets table row 1 2 0 row 2 0 1 row 1 0 2 end table close square brackets space space open square brackets table row 0 row 2 row straight x end table close square brackets equals 0

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124.

Find space straight x space such space that space open square brackets table row cell 1 space space space straight x end cell 1 end table close square brackets space space open square brackets table row 1 3 2 row 2 5 1 row 15 3 2 end table close square brackets space space open square brackets table row 1 row 2 row straight x end table close square brackets space equals 0

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125.

Find space straight x space such space that space space space open square brackets table row cell 1 space space straight x space space 1 end cell end table close square brackets space open square brackets table row 1 2 3 row 4 5 6 row 3 2 5 end table close square brackets space open square brackets table row 1 row cell negative 2 end cell row 3 end table close square brackets space equals 0

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126. $Find space straight x space such space that space space open square brackets table row 1 cell space 1 end cell cell space straight x end cell end table close square brackets space space space open square brackets table row 1 0 2 row 0 2 1 row 2 1 0 end table close square brackets space space open square brackets table row 1 row 1 row 1 end table close square brackets space equals 0$

open square brackets table row 1 1 straight x end table close square brackets space space space open square brackets table row 1 0 2 row 0 2 1 row 2 1 0 end table close square brackets space space open square brackets table row 1 row 1 row 1 end table close square brackets space equals 0 rightwards double arrow space open square brackets table row 1 1 straight x end table close square brackets space space space open square brackets table row cell 1 plus end cell cell 0 plus end cell 2 row cell 0 plus end cell cell 2 plus end cell 1 row cell 2 plus end cell cell 1 plus end cell 0 end table close square brackets equals 0 space space space space space space rightwards double arrow space space open square brackets table row 1 1 straight x end table close square brackets space open square brackets table row 3 row 3 row 3 end table close square brackets equals 0 rightwards double arrow space space space open square brackets table row cell 3 plus 3 plus 3 straight x end cell end table close square brackets space space equals space open square brackets table row 0 end table close square brackets space space space space space space space space space space rightwards double arrow space open square brackets 3 straight x plus 6 close square brackets equals open square brackets table row 0 end table close square brackets rightwards double arrow space space space 3 straight x plus 6 equals 0 space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space rightwards double arrow space space space 3 straight x minus 6 rightwards double arrow space straight x equals negative 2

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127.

Find space straight x space such space that space space space open square brackets table row cell x minus 5 minus 1 end cell end table close square brackets space space open square brackets table row 1 0 2 row 0 2 1 row 2 0 3 end table close square brackets space space open square brackets table row x row 4 row 1 end table close square brackets equals 0 space

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128.

Give example to show that $AB space equals space straight O space even space if space straight A space not equal to space straight O comma space straight B space not equal to space straight O$

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129. Give example to show that AB = O but BA ≠ O

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130. Give example to show that AB ≠ O but BA = O.

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