Answer
4x$^2$+12xy+9y$^2$
Work Step by Step
(A+B)$^2$=A$^2$+2AB+B$^2$
(2x+3y)$^2$
(2x)$^2$+2(2x)(3y)+(3y)$^2$
4x$^2$+12xy+9y$^2$
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