Question

Simplify the expression (3+i)(2+i)

Answer 1

Explanation:

hello :

(3+i)(2+i) = 6+3i+2i+i² but : i² = -1

(3+i)(2+i) = 5+5i

Answer 2

5 +5i

Explanation:

(3+i)(2+i)

FOIL

first 3*2 =6

outer: 3i

inner : 21

last i*i = i^2 = -1

Add them together

6+3i+2i-1

5 +5i