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n^2 entries, where n ∈ N , then it is a square matrix. Is it true or false? Justify your answer.

Is this true or false? Justify your answer.

I've already done this

(2y+5)^2+y^2=5

4y^2+20y+25+y^2=5

5y^2420y+20=0

y^2+4y+4=0

(y+2)^2=0

y+2=0

y=-1

x=2(-2)+5=1

(1,-2)

1=2(-2)+5

(1)^2+(-2)^2)5

Please help because I'm only getting 4/5 for my answer and I'm not sure if I have made some sort of mistake