Simplify the following expression into the form a+bi where a and b are rational numbers (3+7i) (-2-2i) -4i(5-9i)

- 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

x+y=90

x=30-y=x

step-by-step explanation:

if you understand you will get the answer