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Solve for z: (3-2i)/(4i+2) = (4−i)/z

Mathematics

ScanSolve AI Answer

Answer

z=813−6613iz = \frac{8}{13} - \frac{66}{13}i

Step-by-step solution

4 steps

To find the complex number zz, we need to solve the given equation.

  1. Isolate zˉ\bar{z} from the equation.

    The given equation is:

    3−2i4i+2=4−izˉ\frac{3-2i}{4i+2} = \frac{4-i}{\bar{z}}

    Rearrange the equation to solve for zˉ\bar{z}:

    zˉ=4−i3−2i4i+2\bar{z} = \frac{4-i}{\frac{3-2i}{4i+2}} zˉ=(4−i)×4i+23−2i\bar{z} = (4-i) \times \frac{4i+2}{3-2i} zˉ=(4−i)(2+4i)3−2i\bar{z} = \frac{(4-i)(2+4i)}{3-2i}
  2. Expand the numerator.

    (4−i)(2+4i)=4(2)+4(4i)−i(2)−i(4i)(4-i)(2+4i) = 4(2) + 4(4i) - i(2) - i(4i) =8+16i−2i−4i2= 8 + 16i - 2i - 4i^2

    Since i2=−1i^2 = -1:

    =8+14i−4(−1)= 8 + 14i - 4(-1) =8+14i+4= 8 + 14i + 4 =12+14i= 12 + 14i

    So, the equation becomes:

    zˉ=12+14i3−2i\bar{z} = \frac{12+14i}{3-2i}
  3. Rationalize the denominator.

    Multiply the numerator and denominator by the conjugate of the denominator, which is 3+2i3+2i.

    zˉ=12+14i3−2i×3+2i3+2i\bar{z} = \frac{12+14i}{3-2i} \times \frac{3+2i}{3+2i}

    Numerator:

    (12+14i)(3+2i)=12(3)+12(2i)+14i(3)+14i(2i)(12+14i)(3+2i) = 12(3) + 12(2i) + 14i(3) + 14i(2i) =36+24i+42i+28i2= 36 + 24i + 42i + 28i^2 =36+66i+28(−1)= 36 + 66i + 28(-1) =36+66i−28= 36 + 66i - 28 =8+66i= 8 + 66i

    Denominator:

    (3−2i)(3+2i)=32−(2i)2(3-2i)(3+2i) = 3^2 - (2i)^2 =9−4i2= 9 - 4i^2 =9−4(−1)= 9 - 4(-1) =9+4= 9 + 4 =13= 13

    So, we have:

    zˉ=8+66i13\bar{z} = \frac{8+66i}{13} zˉ=813+6613i\bar{z} = \frac{8}{13} + \frac{66}{13}i
  4. Find zz by taking the conjugate of zˉ\bar{z}.

    If zˉ=x+yi\bar{z} = x+yi, then z=x−yiz = x-yi.

    z=813−6613iz = \frac{8}{13} - \frac{66}{13}i
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