Which of the following is a conjugate for -10 + 3i?
10 - 3i, -10 - 3i, 10 + 3i, None of the above

Solution:

A complex number is the sum of a real number and an imaginary number.

A complex number is of the form a + ib and is usually represented by z.

Here both a and b are real numbers.

The value 'a' is called the real part which is denoted by Re(z), and 'b' is called the imaginary part Im(z). 

Also, ib is called an imaginary number.

Given expression is:

-10+3i

This is an complex number 

We know that complex numbers exist in pairs such that their sum gives a real number

Therefore, its conjugate is -10 - 3i

Which of the following is a conjugate for -10 + 3i?

Summary:

The conjugate of -10 + 3i is -10 - 3i