Hi there!
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[tex]( 2x + 3y)^2[/tex]
[tex]= (2x + 3y) (2x + 3y)\\= (2x)(2x)+ (2x) (3y) + (3y)(2x) +(3y)(3y)\\=4x^2 + 6xy + 6xy + 9y^2\\= 4x^2 + 12xy + 9y^2[/tex]
Answer : [tex]4x^2 + 12xy + 9y^2[/tex]
Hope this helped you!