The problem asks to solve the complex equation $2z - (1+i)\overline{z} = -1 + 5i$ for $z$.

AlgebraComplex NumbersComplex ConjugateLinear EquationsSolving Equations
2025/6/2

1. Problem Description

The problem asks to solve the complex equation 2z(1+i)z=1+5i2z - (1+i)\overline{z} = -1 + 5i for zz.

2. Solution Steps

Let z=x+iyz = x + iy, where xx and yy are real numbers. Then the complex conjugate of zz is z=xiy\overline{z} = x - iy.
Substitute z=x+iyz = x + iy and z=xiy\overline{z} = x - iy into the equation:
2(x+iy)(1+i)(xiy)=1+5i2(x + iy) - (1+i)(x - iy) = -1 + 5i
2x+2iy(xiy+ixi2y)=1+5i2x + 2iy - (x - iy + ix - i^2y) = -1 + 5i
Since i2=1i^2 = -1, we have:
2x+2iy(xiy+ix+y)=1+5i2x + 2iy - (x - iy + ix + y) = -1 + 5i
2x+2iyx+iyixy=1+5i2x + 2iy - x + iy - ix - y = -1 + 5i
(2xxy)+(2y+yx)i=1+5i(2x - x - y) + (2y + y - x)i = -1 + 5i
(xy)+(3yx)i=1+5i(x - y) + (3y - x)i = -1 + 5i
Now, equate the real and imaginary parts:
xy=1x - y = -1
3yx=53y - x = 5
We now have a system of two linear equations with two variables:
xy=1x - y = -1 (1)
x+3y=5-x + 3y = 5 (2)
Adding equations (1) and (2), we get:
xyx+3y=1+5x - y - x + 3y = -1 + 5
2y=42y = 4
y=2y = 2
Substitute y=2y = 2 into equation (1):
x2=1x - 2 = -1
x=1+2x = -1 + 2
x=1x = 1
Therefore, z=x+iy=1+2iz = x + iy = 1 + 2i.

3. Final Answer

z=1+2iz = 1 + 2i

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