If \left[\begin{array}{cc}x+y & 7 \ 9 & x-y]\end{array}=\left[\begin{array}{cc}2 & 7 \ 9 & 4]\end{array}, then x \cdot y=____

CBSE Class 12 Math 2020 Outside Delhi Set 1 Solved Paper

Question : 12 of 36

Marks: +1, -0

{[\table x+y , 7 ; 9 , x-y]}={[\table 2 , 7 ; 9 , 4]}

, then

x ⋅ y=

____

Solution:

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