alleryA=[[2,x],[0,1]], B=[[1,3],[2,4]]. If AB has top-right entry 0, find x.
A2/3
B3/2
C-2/3
D-3/2
Answer & Solution
Correct answer: D. -3/2
The top-right entry is 6+4x, so setting it to zero gives x=-3/2.
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