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Given z1 = 3+2i and z2 = -1-5i, find (z1)/(z2) and choose the correct option.

Mathematics

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Answer

A. −12+12i\text{A. } -\frac{1}{2} + \frac{1}{2}i

Step-by-step solution

7 steps
  1. Write the expression for z1z2\frac{z_1}{z_2}.

    Given z1=3+2iz_1 = 3+2i and z2=−1−5iz_2 = -1-5i, we have:

    z1z2=3+2i−1−5i\frac{z_1}{z_2} = \frac{3+2i}{-1-5i}
  2. Multiply the numerator and denominator by the conjugate of the denominator.

    The conjugate of −1−5i-1-5i is −1+5i-1+5i.

    3+2i−1−5i×−1+5i−1+5i\frac{3+2i}{-1-5i} \times \frac{-1+5i}{-1+5i}
  3. Expand the numerator.

    (3+2i)(−1+5i)=3(−1)+3(5i)+2i(−1)+2i(5i)(3+2i)(-1+5i) = 3(-1) + 3(5i) + 2i(-1) + 2i(5i) =−3+15i−2i+10i2= -3 + 15i - 2i + 10i^2

    Since i2=−1i^2 = -1:

    =−3+13i+10(−1)= -3 + 13i + 10(-1) =−3+13i−10= -3 + 13i - 10 =−13+13i= -13 + 13i
  4. Expand the denominator.

    The denominator is in the form (a−bi)(a+bi)=a2+b2(a-bi)(a+bi) = a^2 + b^2. Here, a=−1a=-1 and b=5b=5.

    (−1−5i)(−1+5i)=(−1)2+(5)2(-1-5i)(-1+5i) = (-1)^2 + (5)^2 =1+25= 1 + 25 =26= 26
  5. Combine the simplified numerator and denominator.

    z1z2=−13+13i26\frac{z_1}{z_2} = \frac{-13+13i}{26}
  6. Simplify the expression by dividing both the real and imaginary parts by the denominator.

    z1z2=−1326+1326i\frac{z_1}{z_2} = \frac{-13}{26} + \frac{13}{26}i z1z2=−12+12i\frac{z_1}{z_2} = -\frac{1}{2} + \frac{1}{2}i
  7. Compare the result with the given options.

    The calculated answer is −12+12i-\frac{1}{2} + \frac{1}{2}i.
    Based on the image, option A appears to be −12+12i-\frac{1}{2} + \frac{1}{2}i. Due to the blurriness of the image, this is the closest match.

    The final answer is A. −12+12i\text{A. } -\frac{1}{2} + \frac{1}{2}i.

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