Consider the linear transformation L : R^3 --> R^5 given by L(~x) = A~x where A
is the matrix
A = 1 2 1
2 alpha beta
1 beta 1
2 alpha beta
-1 -2 -1
a) Find dim(ker(L)) as a function of alpha and beta. For what values of alpha, beta; is this as large as possible? For what values of alpha, beta; is this as small as possible?
b) Find dim(Range(L)) as a function of alpha and beta. For what values of alpha, beta; is this as large as possible? For what values of alpha, beta; is this as small as possible?
c) Now consider the vectors
v1 = 1 v2 = 1 v3 = 1
1 1 b
1 a b
What conditions on a; b ensure that these three vectors form a basis?