Do not use a calculator in answering this question. The complex numbers and satisfy the following equations. Find and , giving your answers in the form , where and are real numbers.
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Worked solution
2
1. Express $w$ from the first equation and substitute it into the second equation.
From the first equation, express :
Substitute this expression for into the second equation:
2. Substitute the Cartesian form $z = a + ib$ to separate the real and imaginary parts.
Let , then the conjugate is .
Substitute into the equation:
3. Equate real and imaginary parts and solve the resulting simultaneous equations.
Equating real and imaginary parts gives a system of equations:
From (2), . Substitute this into (1):
Substitute back to find :
So, .
4. Find $w$ using the previously found value of $z^*$.
Since , its conjugate is .
Substitute back into the expression for :
and
AI analysis — may contain mistakes.
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