The expression is given as
[tex](-2+7i)(-1-6i)(6+3i)[/tex]
Solve and simplify the expression by opening the brackets
[tex](2+12i-7i-42i^2)(6+3i)[/tex][tex](2+5i+42)(6+3i)=(5i+44)(6+3i)_{}[/tex][tex]30i+15i^2+264+132i[/tex][tex]162i+264-15=162i+249[/tex]
Hence the answer is
[tex]162i+249[/tex]
