Question

x^2-10ix-21=0...here i is iota​

Answer 1

Answer:

(x-3i)(x-7i)=0

Step-by-step explanation:

x^2-10ix+21i^2=0                i^2=-1

x^2-3ix-7ix+21i^2=0

x(x-3i)-7i(x-3i)=0

(x-3i)(x-7i)=0 Ans

Answer 2

Answer:

final answer is (x+3) (x-7)