Simplify $(2 + 3i)(1 - i)$.
A$2 - 3i$
B$5 + i$CORRECT
C$5 - i$
D$-1 + i$
JUPEBMathematicsComplex Numbers
AI
Toaster Teacher
Why the answer is B, and why the others tempt you.
Expand: $2 - 2i + 3i - 3i^2 = 2 + i - 3(-1) = 5 + i$. Treating $i^2$ as $+1$ gives $-1 + i$, which is the most common error.
Want this in Pidgin, Yoruba, Igbo or Hausa? Sign up free →
Practice more Mathematics questions
JUPEB Mathematics has thousands more questions like this — with Worked answers on every one.