18. f A+B=L: ?) and A-B =[-1. then ...
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18. f A+B=L: ?) and A-B =[-1. then what is the value of AB?

Defence Exams
Maths
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( begin{aligned} & A+B=left[begin{array}{cc}5 & 2 0 & 9end{array}right] ; quad A-B=left[begin{array}{cc}3 & 6 0 & -1end{array}right] Rightarrow 2 A=left[begin{array}{cc}8 & 8 0 & 8end{array}right] Rightarrow A=left[begin{array}{cc}4 & 4 0 & 4end{array}right] B=left[begin{array}{cc}5 & 2 0 & 9end{array}right]-left[begin{array}{cc}4 & 4 0 & 4end{array}right]=frac{B}{3}=left[begin{array}{cc}91 & -2 0 & 35end{array}right] A B=left[begin{array}{cc}4 & 4 0 & 4end{array}right]left[begin{array}{cc}1 & -2 0 & 5end{array}right]=left[begin{array}{cc}4+0 & -8+20 0+0 & 0+20end{array}right] =left[begin{array}{cc}4 & 12 0 & 20end{array}right]=4left[begin{array}{cc}1 & 3 0 & 5end{array}right] end{aligned} )
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