Question

очень нужно , помогите с математикой

Answer 1

$11. C= left(begin{array}{cc}1&4\3&6end{array}right) left(begin{array}{cc}7&-1\-6&1end{array}right) = left(begin{array}{cc}7-24&-1+4\21-36&-3+6end{array}right) = left(begin{array}{cc}-17&3\-15&3end{array}right)$
$12. C= 2left(begin{array}{cc}1&4\3&6end{array}right) +3 left(begin{array}{cc}7&-1\-6&1end{array}right) = left(begin{array}{cc}2&8\6&12end{array}right) +left(begin{array}{cc}21&-3\-18&3end{array}right)$$C=left(begin{array}{cc}2+21&8-3\6-18&12+3end{array}right)=left(begin{array}{cc}23&5\-12&15end{array}right)$