4 years ago

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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