Null space of $$$\left[\begin{array}{cc}-2 & 2\\0 & 0\end{array}\right]$$$

The calculator will find the null space of the $$$2$$$x$$$2$$$ matrix $$$\left[\begin{array}{cc}-2 & 2\\0 & 0\end{array}\right]$$$, with steps shown.
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Your Input

Find the null space of $$$\left[\begin{array}{cc}-2 & 2\\0 & 0\end{array}\right]$$$.

Solution

The reduced row echelon form of the matrix is $$$\left[\begin{array}{cc}1 & -1\\0 & 0\end{array}\right]$$$ (for steps, see rref calculator).

To find the null space, solve the matrix equation $$$\left[\begin{array}{cc}1 & -1\\0 & 0\end{array}\right]\left[\begin{array}{c}x_{1}\\x_{2}\end{array}\right] = \left[\begin{array}{c}0\\0\end{array}\right].$$$

If we take $$$x_{2} = t$$$, then $$$x_{1} = t$$$.

Thus, $$$\mathbf{\vec{x}} = \left[\begin{array}{c}t\\t\end{array}\right] = \left[\begin{array}{c}1\\1\end{array}\right] t.$$$

This is the null space.

The nullity of a matrix is the dimension of the basis for the null space.

Thus, the nullity of the matrix is $$$1$$$.

Answer

The basis for the null space is $$$\left\{\left[\begin{array}{c}1\\1\end{array}\right]\right\}$$$A.

The nullity of the matrix is $$$1$$$A.