MATHS A2 COMPLEX NUMBERS

[zain786]

CAN ANYBODY HELP ME UNDERSTAND HOW TO SOLVE THIS

Q)
FIND CONJUGATES OF

a) 1+7i
b) -2+i
c) 5
d) 3i

 

[littlecloud11]

CAN ANYBODY HELP ME UNDERSTAND HOW TO SOLVE THIS

Q)
FIND CONJUGATES OF

a) 1+7i
b) -2+i
c) 5
d) 3i

Conjugates are a pair of complex number with the same real part but with imaginary parts of equal magnitude and opposite signs.
So, by that. The conjugates of the following are-
a) 1-7i
b) -2-i
c) No conjugate, as it's a real number
d) -3i

 

[Dug]

Conjugates are a pair of complex number with the same real part but with imaginary parts of equal magnitude and opposite signs.
So, by that. The conjugates of the following are-
a) 1-7i
b) -2-i
c) No conjugate, as it's a real number
d) -3i

c)
It does have a conjugate. A real number's conjugate is the real number itself.

3 = 3 + 0i
Conjugate = 3 - 0i = 3

 

[littlecloud11]

c)
It does have a conjugate. A real number's conjugate is the real number itself.

3 = 3 + 0i
Conjugate = 3 - 0i = 3

Oh right! Apologies about that.

 

[zain786]

thanks guys