simplify theses complex numbers to its smallest form (7+3i)(-7+5i)(-8-4i)

can i get help to solve theses complex numbers.
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1 Answer

(-7+5i) * (-8 -4i)...

-7*(-8)=+56,,,, 5i*(-4i)=-20*i^2=+20, so reel part=56+20=76

-7*(-4i)=+28i

-8*5i=-40i......this part giv -12i

anser=76-12i
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