Answer
x$^2$-6xy+9y$^2$
Work Step by Step
(A+B)$^2$=A$^2$+2AB+B$^2$
(x-3y)$^2$
(x)$^2$+2(x)(-3y)+(-3y)$^2$
x$^2$-6xy+9y$^2$
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