jonathan2552526 jonathan2552526

24-11-2020
Mathematics

contestada

What is the sum of 4 - 7i and the conjugate of 2 + 3i ?
A.6 - 4i
B.8 - 21i
C.8 - 4i
D.6 - 10i

Respuesta :

LammettHash LammettHash

24-11-2020

The conjugate of a complex number z = a + b i is z * = a - b i. So

(4 - 7i ) + (2 + 3i )* = (4 - 7i ) + (2 - 3i )

… = (4 + 2) + (-7i - 3i)

… = 6 - 10i

and the answer is D.

Answer Link

Otras preguntas

Represent the following statement by an equation: 17 times the sum of a number n and 31 is 357

I need help in writing a topic sentences for the qualities of an ideal teacher? And What are the qualities of an ideal teacher and how are they applied? What ch

how many positive integers less than 25 can be formed by using the digits 1,2 and 3

Can you solve 2^x=e^(x+2)

A sequence has an initial value of 10 and each term is twice the previous. Which function models this sequence?1. a(n)=10(2)"n2. a(n)=10(2)n-13. a(n)=10+2n4. a

Who is Prince Charming? Thanks in advance

A sequence has an initial value of 10 and each term is twice the previous. Which function models this sequence?1. a(n)=10(2)"n2. a(n)=10(2)n-13. a(n)=10+2n4. a

birds use their beaks to rub their feathers with oil secreted by the?

Explain how Earth's magnetic field and ozone layers protect it .

What is the equation for calculating the heat energy released during heating effect of electric current?