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olga55 [171]
4 years ago
9

GRADUATION HELP PLEASEEEE

Mathematics
2 answers:
Brrunno [24]4 years ago
8 0
= 40 - 56i + 65i - 91i^2
= 40 + 9i + 91
= 131 + 9i

answer is D. 131 + 9i
yuradex [85]4 years ago
4 0
Its simple foil 

(5-7i)(8+13i)

you should know i^2=-1

=40+65i-56i-91i^2
=131+9i
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