Question

(3+5i)(5+7i)

Solve by multiplying complex numbers

Answer 1

`(3 + 5i)(5 + 7i) \in \: \C \\ = 15 + 21i + 25i - 35 \\ = - 20 + 46i \\ = 2( - 10 + 23i)`

Answer 2

-20 + 46i

Explanation:

(3 + 5i) (5 + 7i)

= (3 × 5 - 5 × 7) + (3 × 7 + 5 × 5) i

= (-20) + (46) i

= -20 + 46i