Question
The value of x for which the matrix product
equal an identity matrix is :
The correct answer is: ![fraction numerator 1 over denominator 5 end fraction](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABIAAAAjCAYAAACZ6FpfAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAABGJhU0UAAAAXQ/cXWQAAAIJJREFUeNpjYMAP1IC4FogvMFAIFgNxGhD/Z6ASGDVo1KBBYdB/LHgUDCbwn0w8CoZCDI4WZDQw6BcQfwLibUBcBMQ8lBjIAsTG0IbEDSDWoIYr3YD4ILW8/IMahugA8V1SNa0DYksgZoJiD6ghQaQaFArEt4D4DxC/A+JVQGyKTwMAfKc5il4VJDgAAABidEVYdE1hdGhNTAA8bWF0aCB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMTk5OC9NYXRoL01hdGhNTCI+PG1mcmFjPjxtbj4xPC9tbj48bW4+NTwvbW4+PC9tZnJhYz48L21hdGg+Xdkl9QAAAABJRU5ErkJggg==)
= ![open square brackets table row 1 0 0 row 0 1 0 row 0 0 1 end table close square brackets](data:image/png;base64,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)
=![open square brackets table row 1 0 0 row 0 1 0 row 0 0 1 end table close square brackets](data:image/png;base64,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)
5x = 1, i.e x = 1/5
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