Ask question

Ask question

All categories

3 years ago

10

Which of these represents a quadratic polynomial with exactly two zeros given by - 21 and 2i?

2 answers:

weqwewe [10]3 years ago

8 0

Answer:

B. x² + 4

Step-by-step explanation:

(0+/-√-16)2

+/- 4i / 2

+/- 2i

spin [16.1K]3 years ago

8 0

Answer:

B

Step-by-step explanation:

(x + 2i)(x - 2i)

= x² - 2ix + 2ix - (2i)²

= x² - 4i²

= x² -4(-1)

= x² + 4

You might be interested in

Simplify the expression

Stolb23 [73]

Answer:

A. ${x}^{3} - x - \frac{6}{2x + 3}$

Step-by-step explanation:

$\frac{2 {x}^{4} + 3 {x}^{3} - 2 {x}^{2} - 3x - 6}{2x + 3} \\ \\ = \frac{(2 {x}^{4} + 3 {x}^{3} ) - (2 {x}^{2} + 3x) - 6}{2x + 3} \\ \\ = \frac{ {x}^{3} (2 {x} + 3 ) - x(2 {x} + 3) - 6}{2x + 3} \\ \\ = \frac{ {x}^{3} (2x + 3)}{2x + 3} - \frac{x(2x + 3)}{2x + 3} - \frac{6}{2x + 3} \\ \\ \purple { \bold{= {x}^{3} - x - \frac{6}{2x + 3} }}$

8 0

3 years ago

four boxes to be mailed are weighed at the post office. box A weighs 8.25 pounds box B weighs 8.2 pounds box C weighs 8.225 poun

attashe74 [19]

Box A : 8.25
Box B : 8.2
Box C : 8.225
Box D : 8.05

heaviest box is box A

6 0

3 years ago

Read 2 more answers

Please tell me the answer the steps I need it really fast

Margaret [11]

Answer:

So sorry! Wish I could help : /

Step-by-step explanation:

8 0

3 years ago

Which inequality is represented by this graph?<br> f(0, 1)<br> (5,0)

Novosadov [1.4K]

Answer:

I would say C.

Step-by-step explanation:

7 0

3 years ago

Read 2 more answers

A hubcap has a radius of 12 centimeters. What is the area of the hubcap? Round your answer to the nearest hundredth. Use 3.14 fo

lana66690 [7]

Answer:

The area of hub cap is 452.16 square centimeters.

Step-by-step explanation:

We are given the following in the question:

Radius of hubcap = 12 cm

A hubcap is of the shape of circle.

Area of hubcap = Area of circle

Area of hubcap =

$\pi r^2$

where r is the radius of the hubcap.

Putting the values, we get,

$\pi r^2\\= 3.14\times (12)^2\\= 452.16 \text{ square centimeter}$

Thus, the area of hub cap is 452.16 square centimeters.

8 0

4 years ago