Q. Divide the following complex numbers.−5−2i4+19i
Find Conjugate: To divide complex numbers, we multiply the numerator and denominator by the conjugate of the denominator. The conjugate of a complex number a+bi is a−bi. So, the conjugate of −5−2i is −5+2i.
Multiply Numerator and Denominator: Multiply the numerator (4+19i) and the denominator (−5−2i) by the conjugate of the denominator (−5+2i).(4+19i)×(−5+2i)/((−5−2i)×(−5+2i))
Multiply Numerators: First, we'll multiply out the numerators:(4+19i)×(−5+2i)=−20+8i−95i+38i2Since i2=−1, we can simplify this to:−20+8i−95i−38=−58−87i
Multiply Denominators: Next, we'll multiply out the denominators:(−5−2i)×(−5+2i)=25−10i+10i−4i2Since i2=−1, this simplifies to:25−4(−1)=25+4=29
Divide Numerator by Denominator: Now we divide the simplified numerator by the simplified denominator: (−58−87i)/29
Divide Real and Imaginary Parts: Divide both the real and imaginary parts by 29: Real part: −58/29=−2 Imaginary part: −87i/29=−3i
Combine Real and Imaginary Parts: Combine the real and imaginary parts to get the final answer: −2−3i
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