Practicing Success
If A = \(\begin{bmatrix}6 & -2\\2 & 1 \end{bmatrix}\), then what is the value of |\(-4 { A }^{ T } \)|? |
-160 160 -40 40 |
160 |
If Matrix A has size a × a and k is a constant, then |kA| = \( { k }^{ a } \) |A| Then, |\(-4 { A }^{ T } \)| = \((-4)^{ 2 } \) |\( { A }^{ T } \)| = \((-4)^{ 2 } \) |A | Because |\( { A }^{ T } \) = |A | |\(-4 { A }^{ T } \)| = 16 |A | But |A| = 10 |\(-4 { A }^{ T } \)| = 160 |