Answer
$(a+b)(x^2+3x-11)$
Work Step by Step
$ax^2+3ax-11a+bx^2+3bx-11b=\\=ax^2+bx^2+3ax+3bx-11a-11b\\=x^2(a+b)+3x(a+b)-11(a+b)\\=(a+b)(x^2+3x-11)$
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