1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
lys-0071 [83]
3 years ago
11

Find a quadratic equation with roots -1, 4i and -1 - 4i

Mathematics
1 answer:
vazorg [7]3 years ago
3 0
\bf \textit{difference of squares}
\\\\
(a-b)(a+b) = a^2-b^2\qquad \qquad 
a^2-b^2 = (a-b)(a+b)
\\\\\\
\textit{also recall that }i^2=-1\\\\
-------------------------------\\\\
\begin{cases}
x=-1+4i\implies &x+1-4i=0\\
x=-1-4i\implies &x+1+4i=0
\end{cases}
\\\\\\
(x+1-4i)(x+1+4i)=\stackrel{y}{0}
\\\\\\\
[(x+1)~~-~~(4i)][(x+1)~~+~~(4i)]=y
\\\\\\\
[(x+1)^2~~-~~(4i)^2]=0\implies (x^2+2x+1)~-~(4^2i^2)=y
\\\\\\
(x^2+2x+1)~-~(16\cdot -1)=y\implies (x^2+2x+1)~-~(-16)=y
\\\\\\
x^2+2x+1~~+16=y\implies x^2+2x+17=y
You might be interested in
Question 28
alexandr402 [8]

Answer:

Given Rate of interest is r=8%=0.08

Principal Amount is A=5,000

Time is t years

Interest is compounded yearly twice ⟹n=2

Amount =P(1+

n

r

)

nt

=5000×(1+

2

0.08

)

2t

=5,408

(1.0816)

t

=

5000

5408

⟹t=1

7 0
2 years ago
The pH of a person’s eyes is 7.2. Therefore, the ideal pH for the water in a swimming pool is between 7.0 and 7.6. Write a compo
SpyIntel [72]

Answer:

7.0 < x < 7.6

X is the ideal pH of the swimming pool

5 0
3 years ago
An aircraft factory manufactures airplane engines. The unit C(the cost in dollars to make each airplane engine) depends on the n
blsea [12.9K]
34,590 because even if 0 engines are made, then 34,590 is still expected as a base price
5 0
2 years ago
Mr. Parker has driven 55 miles of a 300-mile trip. If he is traveling at or below the 70 miles per hour speed limit, how much lo
juin [17]

Answer: Mr. Parker can expect the trip to be at least 3 and a half hours

1 tennis racquet and 5 cans of tennis balls

at least 4 days

Step-by-step explanation:

300 - 55 = 245

3.25 x 5 = 16.25       43.75 + 16.25 = 60

40 / 12 = 3.3333333         So you can only visit 3 days with the daily pass before it cost 40 dollars

8 0
3 years ago
Read 2 more answers
Graph the image of this figure after a dilation with a scale factor of centered at the origin.
kvv77 [185]

A picture of the dilated figure with its points at (-2, 10), (2, 6), and (-8, 4) is provided.

<h3 /><h3>What exactly is dilation?</h3>

Dilation is the process of increasing the size of an item without affecting its form. Depending on the scale factor, the object's size can be raised or lowered.

The complete question is;

"Graph the image of this figure after a dilation with a scale factor of 2 centered at (2, 2) .

Use the polygon tool to graph the dilated figure."

The center of dilation and figure are first translated, making the origin the center of dilation.

We map every point because the point (2, 2), which is our center of dilatation, must be translated left 2 and down 2 to become the origin.

(x, y)→(x-2, y-2)

Each point will be multiplied by two when the scale factor is two, giving us the rule.

(x, y)→(2x-4, 2y-4)

In order to return the figure to its original location, we must translate it right 2 and up 2; this gives us the rule.

(x,y)→(2x-4+2, 2y-4+2) = (2x-2, 2y-2)

At the top of the original figure, the first point is (0, 6). When we use the transformation, we get

(0, 6)→(2*0-2, 2*6-2) = (0-2, 12-2) = (-2, 10)

The pre-rightmost image's point is (2, 4). The results of using the transformation rule are;

(2, 4)→(2*2-2, 2*4-2) = (4-2, 8-2) = (2, 6)

The pre-leftmost image's point is at (-3, 3). The transformation rule being applied, w

(-3, 3)→(-3*2-2, 3*2-2) = (-6-2, 6-2) = (-8, 4)

Hence,an picture of the dilated figure with its points at (-2, 10), (2, 6), and (-8, 4) is provided.

To learn more about dilation, refer to

brainly.com/question/13176891.

#SPJ1

7 0
1 year ago
Other questions:
  • 40% of the kids at the picnic went swimming if there were 25 kids, how many went swimming
    14·1 answer
  • Write as an expression and simplify
    8·1 answer
  • Brenda has a square-shaped photo frame. If the area of the square frame is 123 square inches, which statement is true?
    5·1 answer
  • Please help!! I don't get this.
    12·1 answer
  • The following are the ages (years) of 5 people in a room:
    12·1 answer
  • If (one) yard is equal to 3 (three) feet, convert 7 yards to feet​
    8·1 answer
  • If point B is halfway between 0 and 1 on a number line and point A is halfway between 0 and point B , what fraction of 1 does po
    11·1 answer
  • What is the vertex of the graph of the function y=|-3x+2|-4
    7·1 answer
  • A 47 inch piece of steel is cut into three pieces so that the second piece is twiceAs long as the first piece and the third piec
    14·1 answer
  • 2 2/7× 5 1/6<br><br>what is the answer to this question pls tell me ​
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!