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=(2x+3y+4)(2x+3y+4)
=4x^2+6xy+8x+6xy+9y^2+12y+8x+12y+16
=4x^2+(6xy+6xy)+(8x+8x)+(12y+12y)+9y^2+16
=4x^2+12xy+16x+24y+9y^2+16
(2x + 3y + 4)² = (2x)² + (3y)² + 4² + 2.(2x).(3y) + 2.(2x).4 + 2 .(3y) .4
= 4x² + 9y² + 16 + 12.xy + 16 x + 24.y
= 4x² + 9y² + 12.xy + 16.x + 24.y + 16