Question

(√5+√17i)(√5-√17i)=? (give answer in standard a+bi form)

Answer 1

22

Explanation:

Given

(
`√(5)` +
`√(17)` i )(
`√(5)` -
`√(17)` i ) ← expand factors using FOIL

= (
`√(5)` )² - (
`√(17)` )² i² ← i² = - 1

= 5 - 17(- 1)

= 5 + 17

= 22