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
Helen [10]
3 years ago
15

HELP !! ASAP !!

Mathematics
1 answer:
Sedaia [141]3 years ago
7 0

Answer:

The roots are;

x = (2 + i)/5 or (2-i)/5

where the term i is the complex number representing the square root of -1

Step-by-step explanation:

Here, we want to use the completing the square method to solve the quadratic equation;

f(x) = -5x^2 + 4x -1

Set the function to zero

0 = -5x^2 + 4x - 1

So;

-5x^2 + 4x = 1

divide through by the coefficient of x which is -5

x^2 - 4/5x = -1/5

We now take half of the coefficient of x and square it

= -2/5^2 = 4/25

add it to both sides

x^2 - 4x/5 + 4/25= -1/5 + 4/25

(x- 2/5)^2 = -1/5 + 4/25

(x - 2/5)^2 = -1/25

Take the square root of both sides

x - 2/5 = √( -1/25

x - 2/5 = +i/5 or -i/5

x = 2/5 + i/5 or 2/5 - i/5

You might be interested in
Nitrogen makes up about 78% of air. If you have 2 L of air, how many liters of nitrogen are in the air?
NemiM [27]

Answer:39%

Step-by-step explanation:

78/100÷2

78/100×1/2

=39

5 0
3 years ago
2. Sheldon was doing a science experiment about temperature. He first measured the
Burka [1]

Answer:

Temperature dropped by 28°C in two hours

Step-by-step explanation:

<u>Initial measurement:</u>

  • t = 17°C

<u>Measurement 2 hours later:</u>

  • t = - 11°C

<u>The difference:</u>

  • -11°C - 17°C = -28°C

Temperature dropped by 28°C in two hours

7 0
3 years ago
Which of the following explains the relationship between angles B and C? Lines JK and JM intersect at point J, creating four ang
zhenek [66]

Answer:

Adjacent angles

4 0
3 years ago
Read 2 more answers
HELP PLEASEEEE I don’t get it
jek_recluse [69]

10 is answer choice B

11 is answer choice A

7 0
3 years ago
Read 2 more answers
Como dividir 8.2 por 2.87
lakkis [162]
It would equal 11.07. it is right
3 0
3 years ago
Read 2 more answers
Other questions:
  • Sam's track coach stands at the center of a circular track timing Sam's run. Which graph shows Sam's relative distance from the
    7·1 answer
  • shoe sells for a certain company were $25.9 billion. sales are expected to increase by about 20% in the next year. find the proj
    12·1 answer
  • What is 3/48 in simplist form?
    12·2 answers
  • Find the missing term in each pair of equivalent ratios <br> ____:13=48:104
    15·1 answer
  • If y varies inversely with x, and y is 8 when x is 5, find y when x is 2.
    7·1 answer
  • A store is having a sale on 200 dvd movies.some of the movies are being sold for $10 and some are being sold for $12.if the stor
    15·1 answer
  • Which pointis not part of the solution of the inequality y ≥ -|x-4|-3
    8·1 answer
  • Can someone help me with this question
    13·1 answer
  • Write an equation of a line in point slope form that has a slope of -4
    13·1 answer
  • 9α – 8α<br><br> Can someone please answer this question ty
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!