Mdekzat8ieCarme4
Mdekzat8ieCarme4
13-07-2016
Mathematics
contestada
if y = 1 i, then y3 − 3y2
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apologiabiology
apologiabiology
13-07-2016
y^3-3y^2
(1+i)^3-3(1+i)^2
remember
(1+i)^3=(1+i)(1+i)^2
(1+i)(1+i)^2-3(1+i)^2
factor out (1+i)^2
(1+i)^2((1+i)-3)
(1+i)^2(1+i-3)
(1+i)^2(i-2)
(1+i)(1+i)(i-2)
(1+2i-1)(i-2)
(2i)(i-2)
-2-4i
Answer Link
olemakpadu
olemakpadu
13-07-2016
y = 1i = i
y³ - 3y²
(i)³ - 3(i)² i
² = -1, i³ = i²(i) = -i
i³ - 3i²
-i - 3(-1)
-i + 3
Answer Link
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