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Express as a complex number in simplest a+bi form:

(4-22 i)/(2+4i)
Answer:

Express as a complex number in simplest a+bi form:\newline422i2+4i \frac{4-22 i}{2+4 i} \newlineAnswer:

Full solution

Q. Express as a complex number in simplest a+bi form:\newline422i2+4i \frac{4-22 i}{2+4 i} \newlineAnswer:
  1. Multiply Numerators: To express the quotient (422i)/(2+4i)(4-22i)/(2+4i) as a complex number in the form a+bia+bi, we need to eliminate the imaginary unit ii from the denominator. We do this by multiplying the numerator and the denominator by the complex conjugate of the denominator.\newlineThe complex conjugate of (2+4i)(2+4i) is (24i)(2-4i).\newlineNow, multiply the numerator and the denominator by the complex conjugate of the denominator.\newline(422i)/(2+4i)(24i)/(24i)(4-22i)/(2+4i) \cdot (2-4i)/(2-4i)
  2. Expand Numerator: First, multiply the numerators: (422i)(24i)(4-22i)*(2-4i). Use the distributive property (FOIL method) to expand the product: 42+4(4i)22i222i(4i)=816i44i+88i24\cdot2 + 4\cdot(-4i) - 22i\cdot2 - 22i\cdot(-4i) = 8 - 16i - 44i + 88i^2 Since i2=1i^2 = -1, replace 88i288i^2 with 88-88: =816i44i88= 8 - 16i - 44i - 88 Combine like terms: =(888)+(16i44i)=8060i= (8 - 88) + (-16i - 44i) = -80 - 60i
  3. Multiply Denominators: Next, multiply the denominators: (2+4i)(24i)(2+4i)*(2-4i). Again, use the distributive property to expand the product: 22+2(4i)+4i24i4i2\cdot2 + 2\cdot(-4i) + 4i\cdot2 - 4i\cdot4i = 48i+8i16i24 - 8i + 8i - 16i^2 Replace 16i2-16i^2 with 1616, since i2=1i^2 = -1: = 4+164 + 16 Combine like terms: = 2020
  4. Divide Numerator by Denominator: Now, divide the result from the numerators by the result from the denominators: \newline(8060i)/20(-80 - 60i) / 20\newlineDivide both the real part and the imaginary part by 2020:\newline80/20(60i/20)-80/20 - (60i/20)\newline=43i= -4 - 3i
  5. Final Complex Number: The complex number in the form a+bia+bi is 43i-4 - 3i. This is the simplest form of the given complex quotient.

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