Answer
$29-15x+2x^2$
Work Step by Step
Using $(a+b)(c+d)=ac+ad+bc+bd$ or the product of $2$ binomials, the given expression, $
(4-x)(7-2x)
$, is equivalent to
\begin{array}{l}\require{cancel}
4(7)+4(-2x)-x(7)-x(-2x)
\\\\=
29-8x-7x+2x^2
\\\\=
29-15x+2x^2
.\end{array}