Question

( begin{aligned} A &=left[begin{array}{cc}2 & -2 -3 & 4end{array}right] A^{2}=&left[begin{array}{cc}2 & -2 -3 & 4end{array}right]left[begin{array}{cc}2 & -2 -3 & 4end{array}right] =&left[begin{array}{cc}10 & -12 -18 & 22end{array}right] -A^{2}+6 A=left[begin{array}{cc}-10 & 12 18 & -22end{array}right]+left[begin{array}{cc}12 & -12 -18 & 24end{array}right] &=left[begin{array}{cc}2 & 0 0 & 2end{array}right]=2 I end{aligned} )

# 1 x 4 = 2 - 4 - 66 - - 3 4 |

Solution