Ononot — Given T(v) = Av where A = \begin{pmatrix} 1 & 2 \\ 2 & 4 \en

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Vectors & Spacesmedium

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Given $T(v) = Av$ where $A = \begin{pmatrix} 1 & 2 \\ 2 & 4 \end{pmatrix}$ , what is the dimension of the null space (kernel) of $T$ ?