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
ikadub [295]
3 years ago
9

What is the solution to x2 + 10x + 28 = 0 when written in the form a ± bi?

Mathematics
2 answers:
White raven [17]3 years ago
8 0
x^2+10x+28=0\\\\a=1;\ b=10;\ c=28\\\\\Delta=b^2-4ac\\\\\Delta=10^2-4\cdot1\cdot28=100-112=-112\\\\x_1=\dfrac{-b-\sqrt\Delta}{2a};\ x_2=\dfrac{-b+\sqrt\Delta}{2a}\\\\\sqrt\Delta=\sqrt{-12}=i\sqrt{12}=i\sqrt{4\cdot3}=i\sqrt4\cdot\sqrt3=2i\sqrt3

x_1=\dfrac{-10-2i\sqrt3}{2\cdot1}=-5-i\sqrt3\\\\x_2=\dfrac{-10+2i\sqrt3}{2\cdot1}=-5+i\sqrt3
mr Goodwill [35]3 years ago
4 0
Use the quadratic formular:
x=[-10+√(10²-4*1*28)]/2*1 or x=[-10-√(10²-4*1*28)]/2*1
x=[-10+√(-12)]/2 or x=[-10-√(-12)]/2
x=-5+√3i or x=-5-√3i
You might be interested in
PLEASE HELP. I WILL GIVE BRAINLIEST!<br> I'M HAVING SOME TROUBLE.
nalin [4]

Answer:

A.) The coordinates of M' are (-2/4, -4/5)

The coordinates of N' are (1/5, 1)

B.) The scale factor of the dialation is 3

7 0
3 years ago
The maximum number of students in a classroom is 26. if there are 16 students sign up for the art class,how many more students c
Marizza181 [45]
Maximum 12 fr longgg
5 0
3 years ago
Read 2 more answers
Please help I don’t understand how to do these
steposvetlana [31]

Answer:

I think there would be 86 blue marbles

x=4(106 - x ) + 6

x= 424 - 4x + 6

5x= 430

x= 86 blue marbles

Tell me if I'm wrong, hope this helps.

3 0
3 years ago
Identify the parent function​
const2013 [10]

Answer: D

Step-by-step explanation:

Hope this helps!

3 0
2 years ago
What’s the product of 10/1 and 17/5 simplified?
Andru [333]

Answer:

34

Step-by-step explanation:

10/1×17/5

note: 10/1=10

10×17/5

multiply

170/5

34 ans

pls mark brainliest

4 0
2 years ago
Other questions:
  • What is the volume of the pyramid? A. 142 cm3 B. 420 cm3 C. 484 cm2 D. 139 cm3
    5·2 answers
  • -3x &gt;18 values for x for inequality true
    13·1 answer
  • You have towels of 3 sizes. The length of one of them is equal to 3/4m, which makes up 3/5 of the length of the second. The leng
    14·1 answer
  • Which of the following phrases translates to 8 - m?
    12·1 answer
  • Is 8.99 a rational number
    12·1 answer
  • 1. What is the approximate solution of the linear system represented by the graph below?
    15·1 answer
  • Please help me with questions 8 and 10. it would literally save my life :)
    7·1 answer
  • Work out, giving your answer as a mixed number:<br> 4 2/3 + 1 3/4 =
    12·2 answers
  • F(x)=-2x^2+3x+7 find f(3)
    12·1 answer
  • Which number is greater?<br> 2.2 or 15/4 (it is a fraction)
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!