(-5+4i)-(-2-5i)

Question

i need this solved

Answer 1

    -5 + 4i

- (-2  - 5i ) note :  I distribute the -1 through the parenthesis

 

  

 

   -5 + 4i

  +2 + 5i  Note:  Add like terms

  -3  + 9i   note:   same answer as above

                         I used vertical format, which is the way I would do the problem

                          with paper and pencil.  :)  Randy Brown

Answer 2

"i" is considered "imaginary" as the square root of -1 does not exist. So you just add/subtract the real numbers and the imaginary separately. 

 

Thus: (-5+4i)-(-2-5i)=(-5-(-2))+(4i-(-5i))=(-5+2)+(4i+5i)=-3+9i