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Identify the complex number expression.

Mathematics

ScanSolve AI Answer

Answer

3Z∗+2iZ∗−5+i13\frac{3Z^* + 2iZ^* - 5 + i}{13}

Step-by-step solution

9 steps
  1. Identify the complex number expression.

    Let the given expression be WW.

    W=Z−1−i3+2iW = \frac{Z-1-i}{3+2i}
  2. Apply the property of conjugates for division.

    The conjugate of a quotient is the quotient of the conjugates: (AB)∗=A∗B∗\left(\frac{A}{B}\right)^* = \frac{A^*}{B^*}.
    So, the conjugate of WW, denoted as W∗W^*, is:

    W∗=(Z−1−i)∗(3+2i)∗W^* = \frac{(Z-1-i)^*}{(3+2i)^*}
  3. Find the conjugate of the numerator.

    The conjugate of a sum or difference is the sum or difference of the conjugates. The conjugate of a real number is itself, and the conjugate of ii is −i-i.

    (Z−1−i)∗=Z∗−1∗−i∗=Z∗−1−(−i)=Z∗−1+i(Z-1-i)^* = Z^* - 1^* - i^* = Z^* - 1 - (-i) = Z^* - 1 + i
  4. Find the conjugate of the denominator.

    The conjugate of a+bia+bi is a−bia-bi.

    (3+2i)∗=3−2i(3+2i)^* = 3 - 2i
  5. Substitute the conjugates back into the expression for W∗W^*.

    W∗=Z∗−1+i3−2iW^* = \frac{Z^* - 1 + i}{3 - 2i}
  6. Rationalize the denominator.

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

    W∗=Z∗−1+i3−2i×3+2i3+2iW^* = \frac{Z^* - 1 + i}{3 - 2i} \times \frac{3 + 2i}{3 + 2i}
  7. Multiply the denominators.

    (3−2i)(3+2i)=32−(2i)2=9−4i2=9−4(−1)=9+4=13(3 - 2i)(3 + 2i) = 3^2 - (2i)^2 = 9 - 4i^2 = 9 - 4(-1) = 9 + 4 = 13
  8. Multiply the numerators.

    (Z∗−1+i)(3+2i)=Z∗(3)+Z∗(2i)−1(3)−1(2i)+i(3)+i(2i)(Z^* - 1 + i)(3 + 2i) = Z^*(3) + Z^*(2i) - 1(3) - 1(2i) + i(3) + i(2i) =3Z∗+2iZ∗−3−2i+3i+2i2= 3Z^* + 2iZ^* - 3 - 2i + 3i + 2i^2 =3Z∗+2iZ∗−3+i+2(−1)= 3Z^* + 2iZ^* - 3 + i + 2(-1) =3Z∗+2iZ∗−3+i−2= 3Z^* + 2iZ^* - 3 + i - 2 =3Z∗+2iZ∗−5+i= 3Z^* + 2iZ^* - 5 + i
  9. Combine the results to get the final conjugate expression.

    W∗=3Z∗+2iZ∗−5+i13W^* = \frac{3Z^* + 2iZ^* - 5 + i}{13}

    The conjugate of the expression is:

    3Z∗+2iZ∗−5+i13\frac{3Z^* + 2iZ^* - 5 + i}{13}
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