Question

I need help please
-3(10-i)(-7-9i)

Answer 1

well u mltiplty -3 from all the numbers

Answer 2

Do the parenthesis first.

Answer 3

first multiply 10-i with -7-9i

\[(10-i)(-7-9i) \\ 10(-7) + 10(-9i)+(-i)(-7)+(-i)(-9i)\\-70-90i+7i-9\\-79-83i\]

then multiply it by -3
\[-3(79-83i)\\(-3)(79)+(-3)(-83i)\]\[237+249i\]

Answer 4

Thank you!!

Answer 5

yw~