tommytom2002 tommytom2002

14-07-2020
Mathematics

contestada

Evaluate the expression ( 1 + 2 i ) ( − 2 − 1 i ) and write the result in the form a + b i .

Respuesta :

PollyP52 PollyP52

14-07-2020

Answer:

- 5i.

Step-by-step explanation:

( 1 + 2 i ) ( − 2 − 1 i )

= 1 * -2 + 1*-1i + 2i*-2 - 2i*1i

= -2 - i - 4i - 2i^2 i^2 = -1 so we have:

-2 - 5i +2

= 0 - 5i

= -5i.

Answer Link

Otras preguntas

Early poets used rhyme and meter partly because it made stories easier to remember

What is one reason Turkey is having difficulty becoming a full member of the European Union?

Suppose the population of a town is 2,700 and is growing 4% each year. Write an equation to model the population growth. Predict the population after 12 years

What must be done to breed dogs for a particular trait? Mate any dogs and see what variations occur. Place dogs in places where they can acquire the trait. Mate

Alex is being raised in an urban setting with 6 older siblings.Mia is an only child living in a rural area.What type of context is different for these two child

most similar to the one taken by great britain

The war of the roses and England increase the power of what

what is the sum of the arithmetic sequence 3,9,15..., if there are 22 terms

(1/(x-1))-(3/(x^2+2x-3))[tex] \frac{1}{x - 1} - \frac{3}{x {}^{2} + 2x - 3 } [/tex]

Erika's parents don't think that she is likely to succeed in college. As a result, Erika feels very discouraged and stops attending classes, since she believes