Question #a05eb
1 Answer
(a) -2z = 16+(-10)i
(b)
(c)
Explanation:
(a) This part is very simple.
You just have to multiply the constant "-2" with the given
expression "z"
so, -2z= -2(-8+5i) = -2(-8) + (-2)(5i)
= 16-10i or 16+(-10)i
(b) In this part we have to find the conjugate of the given expression "z" , its represented by
by conjugate we mean reversing the sign of the imaginary part.
Here the imaginary part is 5i so we replaace it by "-5i".
Therefore
(c) "
there's an easy formula for this
From the question z= -8+5i
Here a= -8 (real part)
b= 5 (from imaginary part)
and
Now just plug in the values in the formula , it gives:
I hope this helps !
You can tell in the comments , if you have any confusion.