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
grin007 [14]
4 years ago
7

What is the root of this equation? 2x^2 - 4x + 9 = 0​

Mathematics
1 answer:
faust18 [17]4 years ago
4 0

Answer:

x = 1 + i sqrt(7/2) or x = 1 - i sqrt(7/2)

Step-by-step explanation:

Solve for x:

2 x^2 - 4 x + 9 = 0

Divide both sides by 2:

x^2 - 2 x + 9/2 = 0

Subtract 9/2 from both sides:

x^2 - 2 x = -9/2

Add 1 to both sides:

x^2 - 2 x + 1 = -7/2

Write the left hand side as a square:

(x - 1)^2 = -7/2

Take the square root of both sides:

x - 1 = i sqrt(7/2) or x - 1 = -i sqrt(7/2)

Add 1 to both sides:

x = 1 + i sqrt(7/2) or x - 1 = -i sqrt(7/2)

Add 1 to both sides:

Answer:  x = 1 + i sqrt(7/2) or x = 1 - i sqrt(7/2)

You might be interested in
Plssssssss helpppppppppppp i want it now pls​
spin [16.1K]

3/5kg + 760g

3/5kg = 3/5×1000

= 600g

Now

600g + 760g = 1360g

Or 1.36kg

Answered by Gauthmath must click thanks and mark brainliest

6 0
3 years ago
Read 2 more answers
5. If f(x) = -x2 - 7x +4 and g(x) = -5x - 3, what is the value of f(-2)-g(6)
Alex787 [66]

9514 1404 393

Answer:

  47

Step-by-step explanation:

Evaluate the functions and find the required difference.

  f(-2) = -(-2)^2 -7(-2) +4 = -4 +14 +4 = 14

  g(6) = -5(6) -3 = -33

Then the difference is ...

  f(-2) -g(6) = 14 -(-33) = 14 +33 = 47

5 0
3 years ago
PLEASE HELP QUICK <br><br> X= -3<br> What is:<br><br> 2<br> X + X = ?
Elenna [48]
The answer would be negative 9. 2*-3 which is -6 and -6-3 would be -9.
7 0
4 years ago
Need Help please answer
djverab [1.8K]
For the 2nd part of 2. just plug in what you have for G in your previous graph into the equation. This will give you H for all 5 columns . Like 3×8(-1+5)= h = 3× 32= 96 so H should equal 96 and so on as far as this function.

For number 3. The equation is given so just plug in your T for time which is 3 seconds, so...-16(3)^2+90(3) = H the height at 3 seconds. I'm doing it in my head but should be the height is 414. You should also say whether it's ft or inches etc because the teacher or yourself left that out of the equation which is also vital lol.
6 0
3 years ago
What factor is paired with 21 to give 63?
TiliK225 [7]
21 * 3 = 63

So 3 pairs with 21 to make 63.
5 0
4 years ago
Other questions:
  • 30% of what number is 27?
    9·1 answer
  • NEXT QUESTION I WILL GIVE YOU ALL LIKES AND THANKS THANK YOU
    14·2 answers
  • Help on number 21 please :) it will be appreciated
    5·2 answers
  • Which of the following sets of ordered pairs will create a straight line?
    11·1 answer
  • Jikihkhuhjknbnmjk ijklnmjb ?
    10·1 answer
  • Please help me please
    15·1 answer
  • It says if (3,-4) is a point in the terminal side of the angle 0 which one of the following statements is not true
    7·1 answer
  • What is the perimeter of Charlie's second rectangle?​
    14·1 answer
  • Use the number line below to calculate
    7·2 answers
  • Which of the following is a compound event?
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!