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Consider a 2xx2 matrix A=[a(ij)] , where...

Consider a `2xx2` matrix `A=[a_(ij)]` , where `A_(ij)=(i+2j)^2/2`
Write A

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`a_11-(1+1)^2/2=4/2=2`
`a_12=(1+2)^2/2=9/2 `
`a_21=(2+1)^2/2=9/2`
`a_22=(2+2)^2/2=16/2=8`
Hence, `A=[[a_11, a_12],[a_21, a_22]]=[[2, 9/2],[9/2, 8]]`
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