SOLUTION: Find complex conjugate and the product of conjugates, for: sqrt(5)-4i

Question 937672: Find complex conjugate and the product of conjugates, for: sqrt(5)-4i
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
sqrt(5) - 4i
---
complex conjugate:
sqrt(5) + 4i
---
product of conjugates (p):
---
p = (sqrt(5) - 4i) * (sqrt(5) + 4i)
p = sqrt(5)*sqrt(5) + sqrt(5)*4i - sqrt(5)*4i - 4i*4i
p = 5 - 16ii
---
recall that i = sqrt(-1) and ii = -1
---
p = 5 - 16(-1)
p = 5 + 16
p = 21
---
Free algebra tutoring live chat:
https://sooeet.com/chat.php?gn=algebra
---
Solve and graph linear equations:
https://sooeet.com/math/linear-equation-solver.php
---
Solve quadratic equations with quadratic formula:
https://sooeet.com/math/quadratic-formula-solver.php
---
Solve systems of linear equations up to 6-equations 6-variables:
https://sooeet.com/math/system-of-linear-equations-solver.php
---
RELATED QUESTIONS
find the complex conjugate of:... (answered by TimothyLamb)

Find the product of 3+sqrt(6) and its complex conjugate. (answered by ikleyn)

find the complex conjugate number. then find the product of the complex number and its... (answered by josmiceli)

Prove that the complex conjugate of the sum of two complex numbers a+bi and c+di is the... (answered by CharlesG2)

find the product of the given complex number and its conjugate... (answered by jim_thompson5910)

Find the product of the complex number and its conjugate. 1 +... (answered by tommyt3rd)

find the product of the complex number and its conjugate.... (answered by stanbon)

Find the equation of a degree 4 polynomial with zeros x=5, x=−6, and x=1+i. It passes... (answered by ikleyn)