`a)`
`(x + 1)^2`
`= (x + 1)(x + 1)`
`= x(x + 1) + 1(x + 1)`
`= x^2 + x + x + 1`
`= x^2 + 2x + 1`
`b)`
`(x + 2)^2`
`= (x + 2)(x + 2)`
`= x(x + 2) + 2(x + 2)`
`= x^2 + 2x + 2x + 4`
`= x^2 + 4x + 4`
`d)`
`(x + 6)^2`
`= (x + 6)(x + 6)`
`= x(x + 6) + 6(x + 6)`
`= x^2 + 6x + 6x + 36`
`= x^2 + 12x + 36`
`e)`
`(2xy + y)^2`
`= 4x^2y^2 + 4xy^2 + y^2`
`g)`
`(3xy + 2y)^2`
`= 9x^2y62 + 12xy^2 + 4y^2`