Perform the operation and write the result in standard form.
(10 + 9i) - (-5 - i)

Question

Perform the operation and write the result in standard form.
(10 + 9i) - (-5 - i)

anonymous · Answer

somebody please help , thanks =)

anonymous · Answer

everybody feel free to help the more the marrior lol =)

anonymous · Answer

it's like combining like terms.. combine the real parts and combine the imaginary parts...
real part:  10 - (-5) = 15
imaginary part: 9i - (-i) = 10i
so you have: 15 + 10i

anonymous · Answer

i got ...... 15+8i ???

kainui · Answer

remember the negative on the second term turns -(-5-i) into (5+i) not (5-i)! Almost right leah!

anonymous · Answer

o, 5+8i ????

kainui · Answer

Oh nope, backwards. It changes into (10+9i)+(5+i) and when you drop the parenthesis you get 10+9i+5+i

asnaseer · Answer

try doing this one step at a time.
so starting with this:                                             (10 + 9i) - (-5 - i) 
we first remove the braces around (-5 - i) to get: (10 + 9i) + 5 + i       [because - & - = +]

asnaseer · Answer

understand so far?

asnaseer · Answer

have you heard of the rule that two minuses make a plus?

anonymous · Answer

15+10i  ???

asnaseer · Answer

yes - that is correct