Find the real number x and y in the expression ( 1 + i )( x-1 ) + ( 1 - i )( y + 1 ) = 1 - 3i

2 Answers | Add Yours

sciencesolve's profile pic

sciencesolve | Teacher | (Level 3) Educator Emeritus

Posted on

You need to open the brackets:

x - 1 + ix - i + y + 1 - iy - i = 1 - 3i

You need to rearrange the terms from the left side such that:

(x - 1 + y + 1) + i(x - 1 - y - 1) = 1 - 3i

Reducing the opposite terms inside the brackets yields:

x + y + i(x - y - 2) = 1 - 3i

Equating real parts yields:

x + y = 1

Equating imaginary parts yields:

x - y - 2 = -3 => x - y = -3+2 => x - y = -1

Adding the first equation to the second yields:

x + y + x - y = 1 - 1 => 2x = 0 => x = 0 => y = 1

The solution to the given identity is x = 0 ; y = 1.

We’ve answered 334,342 questions. We can answer yours, too.

Ask a question