Skip to content
Could you also show how you worked it out please
(a+bi)(a+bi) = 21 - 20i
(a^2)+(2abi)+(b^2 x i^2) = 21 - 20i
(a^2)+(2abi) - b^2 = 21 - 20i
Equate real parts: a^2-b^2 = 21
Equate imaginary parts: 2ab = 20
Then solve simultaneously.
The answers will be (a+bi) and (a-bi), so on an argand diagram they will be reflections in the x axis.
Ahh thank you so much :)