Work Step by Step
$(5x + 1 + 6y)^2$ $=(5x + 1 + 6y)(5x + 1 + 6y)$ $=25x^2+5x+30xy+5x + 1 + 6y+30xy+6y+36y^2$ $=25x^2+10x+60xy+12y+36y^2+1$
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