Answer
3(7x+4y)(x+y)
Work Step by Step
p=3(7$x^{2}$+11xy+4$y^{2}$)=3(7$x^{2}$+7xy+4xy+4$y^{2}$)=
3[7x(x+y)+4y(x+y)]=3(7x+4y)(x+y)
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