Answer
A$^2$+2AB+B$^2$
4x$^2$+12x+9
Work Step by Step
The formula for a squared binomial (A+B) is:
(A+B)$^2$=A$^2$+2AB+B$^2$
(2x+3)$^2$
(2x)$^2$+(2)(2x)(3)+(3)$^2$
4x$^2$+12x+9
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