Determine whether $\{(x_1,x_2,x_3)^T \mid x_1 = x_2 = x_3\}$ is a subspace
I know that I must show that it is closed under addition and multiplication, but I'm confused as to how I should approach doing that.
Determine whether $\{(x_1,x_2,x_3)^T \mid x_1 = x_2 = x_3\}$ is a subspace
I know that I must show that it is closed under addition and multiplication, but I'm confused as to how I should approach doing that.