For questions A8 and A9 below, let v = [ 1 , 2 , 3 , 4 ] {\textstyle {\mathbf {v}}=[1,2,3,4]} and x = [ a , a , a , a ] {\textstyle {\mathbf {x}}=[a,a,a,a]} for some constant a {\textstyle a} . Briefly justify your answers.
A8) For which nonzero value or values of a (if any) is | v | = | x | {\textstyle |{\mathbf {v}}|=|{\mathbf {x}}|} ?
![{\textstyle {\mathbf {v}}=[1,2,3,4]}](https://wiki.ubc.ca/api/rest_v1/media/math/render/svg/502510decfa5351945a4bf4562e9803cf4a90e65)
![{\textstyle {\mathbf {x}}=[a,a,a,a]}](https://wiki.ubc.ca/api/rest_v1/media/math/render/svg/cfeb9addcf6901b5c6da9fb11d3d09ac6dcfa8ee)
