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Simplify the expression to a + bi form:

(12-4i)(-6-9i)
Answer:

Simplify the expression to a + bi form:\newline(124i)(69i) (12-4 i)(-6-9 i) \newlineAnswer:

Full solution

Q. Simplify the expression to a + bi form:\newline(124i)(69i) (12-4 i)(-6-9 i) \newlineAnswer:
  1. Use Distributive Property: To simplify the expression (124i)(69i)(12-4i)(-6-9i), we need to use the distributive property (also known as the FOIL method for binomials), which states that for any complex numbers aa, bb, cc, and dd, (a+bi)(c+di)=ac+adi+bci+bdi2(a + bi)(c + di) = ac + adi + bci + bdi^2. Let's multiply the real parts and the imaginary parts accordingly.
  2. Multiply Real Parts: First, we multiply the real parts: 12×(6)=7212 \times (-6) = -72.
  3. Multiply Real and Imaginary: Next, we multiply the real part of the first complex number by the imaginary part of the second complex number: 12×(9i)=108i12 \times (-9i) = -108i.
  4. Multiply Imaginary and Real: Then, we multiply the imaginary part of the first complex number by the real part of the second complex number: (4i)×(6)=24i (-4i) \times (-6) = 24i .
  5. Multiply Imaginary Parts: Finally, we multiply the imaginary parts: (4i)×(9i)(-4i) \times (-9i). Since i2=1i^2 = -1, this becomes 4×9×i2=36×1=36-4 \times -9 \times i^2 = 36 \times -1 = -36.
  6. Combine All Parts: Now, we combine all the parts: real part 72-72, imaginary parts 108i+24i-108i + 24i, and the result of the multiplication of the imaginary parts 36-36.\newlineSo, 72108i+24i36-72 - 108i + 24i - 36.
  7. Combine Like Terms: Combine like terms: 7236-72 - 36 is the real part, and 108i+24i-108i + 24i is the imaginary part.\newlineThe real part is 7236=108-72 - 36 = -108.\newlineThe imaginary part is 108i+24i=84i-108i + 24i = -84i.
  8. Get Final Expression: Putting it all together, we get the expression in a+bia + bi form: 10884i-108 - 84i.

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