Question

(1+2i)×(3+i) simplify​

Answer 1

Answer:

$-3+7i$

Step-by-step explanation:

$i=\sqrt{-1}$

$(1+2i)(3+i)\\=3+i+6i+6i^2\\=(3-6)+(1+6)i\\=-3+7i$

∴$-3+7i$