Answer
$3x^2+5x+2$
Work Step by Step
Formula to calculate the area of a rectangle = Length X Breadth
Thus, $12x^3+23x^2+13x+2=(4x+1) \times B$
$B=\dfrac{12x^3+23x^2+13x+2}{3x(x+5)}$
$=3x^2+5x+2$
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