Question

20-(10+√20i)+5+(7+√45i)

Answer 1

Jussara,
Vamos passo a passo

$20 -(10+ \sqrt{20}i) + 5 +(7+ \sqrt{45}i) \\ \\ =20 - 10- \sqrt{20}i +5 + 7+ \sqrt{45}i \\ \\ =22 -2 \sqrt{5}i+3 \sqrt{5}i \\ \\ =22+ \sqrt{5}i$