Question

What is the answer to this problem in a + bi form? (8 - 5i)(3 - 7i)

Answer 1

we have

(8 - 5i)(3 - 7i)​

Apply distributive property

(8*3)--8*(7i)-3*(5i)+(5i)*(7i)

24-56i-15i+35i^2

Remember that

i^2=-1

so

24-56i-15i+35*(-1)

combine like terms

-11-71i