Work Step by Step
$$(2x+3)^2$$ $$=(2x+3)(2x+3)$$ $$=(2x\times 2x)+(2x\times 3)+(3\times 2x)+(3\times 3)$$ $$=4x^2+6x+6x+9$$ $$=4x^2+12x+9$$
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