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topjm [15]
2 years ago
7

Which of the following complex numbers is 2- equivalent to ? (Note: i= -1) 2+i

Mathematics
2 answers:
Vinvika [58]2 years ago
7 0

Answer:

A

Step-by-step explanation:

Given

\frac{2-i}{2+i}

Multiply the numerator/ denominator by the conjugate of the denominator.

The conjugate of 2 + i is 2 - i , then

= \frac{(2-i)(2-i)}{(2+i)(2-i)} ← expand numerator/ denominator using FOIL

= \frac{4-4i+i^2}{4-i^2}  [ i = \sqrt{-1} ⇒ i² = - 1 ]

= \frac{4-4i-1}{4+1}

= \frac{3-4i}{5}

= \frac{3}{5} - \frac{4}{5} i → A

muminat2 years ago
4 0

Answer:

i = the square root of -1

Step-by-step explanation:

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3 years ago
What is the relationship between the lines determined by the following two equations?
oksano4ka [1.4K]

Answer:

C. They are the same line.

Step-by-step explanation:

In order to compare the linear equations given, they need to be in the same form.  The best form in order to evaluate slope and y-intercept is slope-intercept form, y = mx + b.  Since the second equation is already in slope-intercept form, we need to use inverse operations to convert the first equation:

6x - 2y = 16 ----  6x - 2y - 6x = 16 - 6x ----  -2y = -6x + 16

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4 0
3 years ago
Pls help I will mark brainlist if correct !! :)
Kruka [31]

Answer:

a and b

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
Plzzz helpppp itssss urgentt!!!!!!!!
azamat

Answer:

4) 40 Square inches

Step-by-step explanation:

You do 2 x 4 then divide by 2. after that you multiply by 4.  Then you add the square which is 2 x 2

6 0
3 years ago
Multiple Choice
Zigmanuir [339]

Answer:

the slope is POSITIVE (answer A)

Step-by-step explanation:

The line goes through: (-1, -2)  and ( 2, 1)

Then the slope can be calculated as:

slope = (y2 - y1) / (x2 - x1)

in our case:

slope = (1 - -2) / (2 - -1) = (1 + 2) / (2 + 1) = 3 / 3 = 1

Therefore, the slope is POSITIVE (answer A)

8 0
3 years ago
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