Question

Me ajudem por favor
Calcule:
a) (4+5i)+(1+2i)
b) (-2+3i)-(5+9i)
c) (4+i)-(-5-7i)
d) (-20-8i)-(-18+7i)
Preciso da conta 

Answer 1

a) $(4+5i)+(1+2i)\\\\ 4+1+5i+2i\\\\ \boxed{5+7i}$

b) $(-2+3i)-(5+9i)\\\\ -2-5+3i-9i\\\\ \boxed{-7-6i}$

c) $(4+i)-(-5-7i)\\\\ 4-(-5)+i-(-7i)\\\\ 4+5+i+7i\\\\\ \boxed{9+8i}$

d) $(-20-8i)-(-18+7i)\\\\ -20-(-18)-8i-7i\\\\ -20+18-15i\\\\ \boxed{-2-15i}$