Answer:
- 28 - 40i
note that i² = (√-1)² = - 1
expand product of factors using FOIL
= - 6 - 6i - 14i - 14i² - 20i + 36i²
= - 6 - 6i - 14i + 14 - 20i - 36
= - 28 - 40i
Step-by-step explanation:
Got right on PLATO
The solution to the complex expression (3+7i) (-2-2i) -4i(5-9i) is -28 - 40i
A complex number is a number of the form a + bi, where a and b are real numbers, and i = √-1
i² = (√-1)² = -1
Given the expression:
(3+7i) (-2-2i) -4i(5-9i)
= -6 - 14i -6i + 14 - 4i(5 - 9i)
= 8 - 20i - 20i - 36
= -28 - 40i
The solution to the complex expression (3+7i) (-2-2i) -4i(5-9i) is -28 - 40i
Find out more on complex number at: https://brainly.com/question/10662770
#SPJ2
