Question

Sabendo w=4+3i e z=1-i, a parte real de z.w vale ?

a)1
b)3
c)4
d)7
e)n.d.a

Answer 1

$(1-i)\times(4+3i)=4+3i-4i-3i^2=4+3i-4i+3=7-i$

Alternativa D. A parte real vale 7.