Thank you for the opportunity to help you with your question!
is very easy just :
(a+5)(a^2-8a+8) = a*a^2 - 8*a*a + 8*a +5*a^2 - 5*8*a + 5*8 = a^3 - 8a^2 +8a + 5a^2 - 40a +40
= a^3 - 3a^2 - 32a + 40
if you don't understand just ask
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