Answer:
10
Step-by-step explanation:
We are going to substitute x = 3 - i into the expression x² - 6x
* Remember than i² = (√-1)² = -1. so when we multiply and get i² we're going to transform it into -1.*
⇒ [tex]x^2-6x = (3 - i)^2 - 6 (3-i) = 9 - 6i+i^2 -18+6i\\=9 - 6i-1-18+6i\\=-10[/tex]
Thus, x² - 6x = 10 when x = 3-i
