Answer
$x^2-1.3x+0.40$
Work Step by Step
Using $(a+b)(c+d)=ac+ad+bc+bd$ or the product of 2 binomials, the product of the given expression, $
(x-0.8)(x-0.5)
,$ is
\begin{array}{l}\require{cancel}
x(x)+x(-0.5)-0.8(x)-0.8(-0.5)
\\\\=
x^2-0.5x-0.8x+0.40
\\\\=
x^2-1.3x+0.40
.\end{array}
