If z1=2-i andz2=1+i then z1−z2+1z1+z2−i equals
53
35
45
54
Explanation for the correct option:
Finding the value of z1−z2+1z1+z2−i:
The given points are z1=2-i andz2=1+i
As we are all aware, ab=ab
z1−z2+1z1+z2−i=2−i+1+i+12−i−1−i+i=41−i×1+i1+i=41+i2=2+2i...i
As we all know, a+ib is a2+b2
From i, we get
2+2i=22+22=8=22
Hence, the correct option is C.
Find the value of y when x=-5.
y=15x+1