The matrix A= 1 -1 1 1 defines a transformation of R². Select all true statements about this

Question

The matrix A= 1    -1
                          1     1 
defines a transformation of R². Select all true statements about this transformation. A
  A rotates every vector by 45° anti-clockwise.
 A halves the area. have an inverse?
 A rotates every vector by 45° clockwise. 
A stretches every vector by the same factor.
 For which value or values of a does the matrix  
                                                    A= x    -x
                                                         -x     x 
○ x = -1,0,1 
O No values of a 
O x = 0 
O x = = 1

Kunduz · Accepted Answer

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