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prove these are subspaces of R^2 and R^3 1. {[ 0 X ] : x is...

prove these are subspaces of R^2 and R^3
1. {[ 0 X ] : x is an element of R}
2. {[1 X ] : X is an element of R}
3. {[ x+2 x+2]: X is an element of R}

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