Question

If z1 = 2+3i and z2 = 5+2i, then find sum of two complex numbers.

(a) 4+8i

(b) 3-i

(c) 7+5i

(d) 7-5i

The question was posed to me in a national level competition.

This interesting question is from Complex Numbers-1 in section Complex Numbers and Quadratic Equations of Mathematics – Class 11

Answer 1

Correct answer is (c) 7+5i

For explanation I would say: In addition of two complex numbers, corresponding parts of two complex numbers are added i.e. real parts of both are added and imaginary parts of both are added.

So, sum = (2+5) + (3+2) i = 7+5i.