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FromTheMoon [43]
3 years ago
15

Submit A: What are the solutions to the quadratic equation x2+4=0? B: What is the factored form of the quadratic expression x2+4

? Select one answer for question A, and select one answer for question B. A: x=−2 A: x=2i or x=−2i A: x=2i A: x=2 or x=−2 B: (x+2i)(x−2i) B: (x+2)(x+2) B: (x+2i)(x+2i) B: (x+2)(x−2)
Mathematics
1 answer:
geniusboy [140]3 years ago
8 0

Answer:

  A: x=2i or x=−2i

  B: (x+2i)(x-2i)

Step-by-step explanation:

A: Subtracting 4 from the equation gives ...

  x² = -4

Taking the square root gives the imaginary result(s) ...

  x = ±√(-4) = ±2i

So, the solutions are ...

  x = 2i or x = -2i

___

B: If x=a is a solution to a quadratic equation, then (x-a) is a factor of it. The factored form of the equation is ...

  (x -2i)(x +2i) = 0

So the factored form of the expression on the left can be written as ...

  (x+2i)(x-2i)

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How do you graph a complex number and calculate the modules?
Nata [24]

Remember that the Quadratic Formula<span> solves "</span><span>ax2 + bx + c = 0</span><span>" for the values of </span>x<span>. Also remember that this means that you are trying to find the </span>x-intercepts of the graph. When the Formula gives you a negative inside the square root, you can now simplify that zero by using complex numbers. The answer you come up with is a valid "zero" or "root" or "solution" for "<span>ax2 + bx + c = 0</span><span>", because, if you plug it back into the quadratic, you'll get zero after you simplify. But you cannot graph a complex number on the </span>x,y<span>-plane. So this "solution to the equation" is not an </span>x-intercept. You can make this connection between the Quadratic Formula, complex numbers, and graphing:

<span><span><span>x2 – 2x – 3</span><span>x2 – 6x + 9</span><span>x2 + 3x + 3</span></span><span>a positive number inside the square rootzero inside the square roota negative number inside the square root</span><span>two real solutionsone (repeated) real solutiontwo complex solutions</span><span><span><span>two distinct </span>x-intercepts</span><span><span>one (repeated) </span>x-intercept</span><span><span>no </span>x-intercepts</span></span></span>

 

<span><span> ADVERTISEMENT</span><span> </span></span>

<span>As an aside, you can graph complexes, but not in the </span>x,y<span>-plane. You need the "complex" plane. For the complex plane, the </span>x<span>-axis is where you plot the real part, and the </span>y<span>-axis is where you graph the imaginary part. For instance, you would plot the complex number </span><span>3 – 2i</span><span> like this:</span>


<span>This leads to an interesting fact: When you learned about regular ("real") numbers, you also learned about their order (this is what you show on the number line). But </span>x,y<span>-points don't come in any particular order. You can't say that one point "comes after" another point in the same way that you can say that one number comes after another number. For instance, you can't say that </span>(4, 5)<span> "comes after" </span>(4, 3)<span> in the way that you can say that </span>5<span> comes after </span>3<span>. Pretty much all you can do is compare "size", and, for complex numbers, "size" means "how far from the origin". To do this, you use the </span>Distance Formula, and compare which complexes are closer to or further from the origin. This "size" concept is called "the modulus". For instance, looking at our complex number plotted above, its modulus is computed by using the Distance Formula:   Copyright © Elizabeth Stapel 2000-2011 All Rights Reserved

<span>Note that all points at this distance from the origin have the same modulus. All the points on the circle with radius </span>sqrt(13)<span> are viewed as being complex numbers having the same "size" as </span><span>3 – 2i</span><span>.</span>

3 0
3 years ago
Hey can anyone help me in dis math problem real quick!!!!!
navik [9.2K]

Answer:

Step-by-step explanation:

The images are the same because in each there is a triangle shape and also they both have a right angle.

The images are Different because one is 3 dimensional and the other is 2 dimensional and Shape A has 2 angles where Shape B has 1 angle.

Hope this helped! :3

3 0
3 years ago
Questions 1-6 , need help ASAP , will award you brainiest
nika2105 [10]

Answer:

1. 13+10i

2. 28-(-4i)

3. -14-1i

4. 4 -i

5. 15+ 10i

6.8 - 5i^2

Step-by-step explanation:

8 0
3 years ago
What are the answers for 7 and 8??? please help
wolverine [178]

Answer:

7.)

Therefore FT is 33 unit.

8.)

Therefore SU is 98 unit.

Step-by-step explanation:

7.)

Given:

ΔFUT ~ ΔFHG

FU = 39

FH = 130

FG = 110

To Find:

FT = ?

Solution:

ΔFUT ~ ΔFHG  ............Given

If two triangles are similar then their sides are in proportion.  

\dfrac{FU}{FH} =\dfrac{FT}{FG} \textrm{corresponding sides of similar triangles are in proportion}\\

Substituting the values we get

\dfrac{39}{130} =\dfrac{FT}{110}\\\\FT=\dfrac{110\times 39}{130}=33\\FT=33\ unit  

Therefore FT is 33 unit.

8.)

Given:

ΔSTU ~ ΔFED

ST= 63

FE = 9

FD = 14

To Find:

SU = ?

Solution:

ΔSTU ~ ΔFED  ............Given

If two triangles are similar then their sides are in proportion.  

\dfrac{ST}{FE} =\dfrac{SU}{FD} \textrm{corresponding sides of similar triangles are in proportion}\\

Substituting the values we get

\dfrac{63}{9} =\dfrac{SU}{14}\\\\SU=\dfrac{882}{9}=98\\\\SU=98\ unit

Therefore SU is 98 unit.

5 0
3 years ago
9​in the power of 3 is equal to 3in the power of M, What number is M?<br> Help​ me please~°~​
zhannawk [14.2K]

Answer:

6

Step-by-step explanation:

9 ^3 =3^m

(3^2) ^3 =3^m

3 ^(2×3)=3^m

3 ^6 =3 ^m

m =6

8 0
3 years ago
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