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maka :
1(2)⁴ + 4(2)³(-5i) + 6(2)²(-5i)² + 4(2)(-5i)³ + 1(-5i)⁴
16 - 160i + 600i² - 1000i³+ 625i⁴
atau :
625i⁴ - 1000i³ + 600i² - 160i + 16
(2 - 5i)(2 - 5i)(2 - 5i)(2 - 5i)
(4 - 10i -10i + 25i²)(2 - 5i)(2 - 5i)
(4 - 20i + 25i²)(2 - 5i)(2 - 5i)
(8 - 20i - 40i + 100i² + 50i² - 125i³)(2 - 5i)
(8 - 60i + 150i² - 125i³)(2 - 5i)
16 - 40i - 120i + 300i² + 300i² - 750i³ - 250i³ + 625i⁴
16 - 60i + 600i² - 1000i³ + 625i⁴