The square of (1 + 3Y) (3y-1) - 3 (1 + 2Y) (2y-1) + (4Y + 1) =? | Math enthusiast | Mathematical art

The square of (1 + 3Y) (3y-1) - 3 (1 + 2Y) (2y-1) + (4Y + 1) =?

The square of (1 + 3Y) (3y-1) - the square of 3 (1 + 2Y) (2y-1) + (4Y + 1)
=9y²-1-3(4y²-1)+(16y²+8y+1)
=9y²-1-12y²+3+16y²+8y+1
=13y²+8y+3

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