Answer
$(x-7)(x-4)$.
Work Step by Step
The given polynomial is
$=x^2-11x+28$
Rewrite $-11x$ as $-7x-4x$.
$=x^2-7x-4x+28$
Group the terms.
$=(x^2-7x)+(-4x+28)$
Factor each group.
$=x(x-7)-4(x-7)$
Factor out $(x-7)$.
$=(x-7)(x-4)$
Hence, the factor of the polynomial is $(x-7)(x-4)$.
