Linear maps: Linear maps
Invertibility criteria for linear maps
Let #L_A:\mathbb{R}^2\to\mathbb{R}^2# be the linear map defined by the matrix
\[A = \matrix{a & 15\\ -2 & 6}\]
For what value of #a# is this map not invertible?
Give your answer in the form of an equation for #a#.
\[A = \matrix{a & 15\\ -2 & 6}\]
For what value of #a# is this map not invertible?
Give your answer in the form of an equation for #a#.
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