Question

Simplify.(5+3i)(4-i)

Answer 1

(5+3i)(4-i)

=>20+5i+12i-3i^2
=>20+17i-3i^2
=>-3i^2+17i+20
=>-3i^2-20i+3i+20
=>-i(3i+20)+1(3i+20)
=>(-i+1)(3i+20)

(-i+1)=0
-i=-1
i=1

(3i+20)=0
i=-20/3........HOPE THIS HELPS U......