Question

Se z = 1 + i e w = 3i, então z, w vale: a) -3-3i b) 3+3i c) -3+3i d) 3-3i

Answer 1

z = 1 + i e w = 3i, então z . w vale: a) -3-3i b) 3+3i c) -3+3i d) 3-3i

z.w = 3i(1 + i)

z.w = 3i + 3i²

z.w = 3i + 3(-1)

z.w = 3i - 3  ou  z.w =  - 3 + 3i     Letra  C