Answer
$2\times(8\div4-20)$
Work Step by Step
$2\times(8\div4-20)$ $\longrightarrow$ resolve expression in parenthesis; divide
=$2\times(2-20)$ $\longrightarrow$ resolve expression in parenthesis; subtract
=$2\times(-18)$ $\longrightarrow$ multiply
=$-36$