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
andreyandreev [35.5K]
2 years ago
12

. What are the exact solutions of x2 - x - 4 = 0?

Mathematics
2 answers:
Dimas [21]2 years ago
7 0
X ² - x - 4 = 0
x_{1}  = \frac{1+ \sqrt{1+16}  }{2}= \frac{1+ \sqrt{17} }{2} = 2.56
x_{2} =  \frac{1- \sqrt{17} }{2}= - 1.56
Exact values are x 1 = 2.56 and x 2 = -1.56

Snowcat [4.5K]2 years ago
3 0

Answer:

x=\frac{1+\sqrt{17}}{2}  and x=\frac{1-\sqrt{17}}{2}

Step-by-step explanation:

x^2 - x - 4 = 0

To solve for x , apply quadratic formula

x=\frac{-b+-\sqrt{b^2-4ac}}{2a}

a=1 , b= -1 , c= -4

Plug in all the values in the formula

x=\frac{-(-1)+-\sqrt{(-1)^2-4(1)(-4)}}{2(1)}

x=\frac{1+-\sqrt{1+16}}{2}

x=\frac{1+-\sqrt{17}}{2}

x=\frac{1+\sqrt{17}}{2}  and x=\frac{1-\sqrt{17}}{2}

You might be interested in
Super confused definitely need help on this
Marat540 [252]

Answer:

(x-5)(x+8)=x^2+3x-40

Step-by-step explanation:

So we have the expression:

(x-5)(x+8)

To multiply, distribute the left to the terms on the right:

=(x-5)(x)+(x-5)(8)

Distribute:

=(x^2-5x)+(8x-40)

Combine like terms:

=(x^2)+(-5x+8x)+(-40)

Simplify:

=x^2+3x-40

Therefore:

(x-5)(x+8)=x^2+3x-40

6 0
3 years ago
Read 2 more answers
Yolanda paid for her movie ticket using 28 coins, all nickels and quarters. The ticket cost $4. Which system of linear equations
Anvisha [2.4K]

Answer:

n + q = 28 0.05n + 0.25q = 4

3 0
3 years ago
Read 2 more answers
Which graph/graphs are proportional? Please hurry!
Paul [167]
I’m 89% sure it’s d
hope it helped :)
3 0
2 years ago
Cube root of b to the 12 power​
kvv77 [185]

\sqrt[3]{b^{12}}=\sqrt[3]{(b^4)^3}=b^4

6 0
2 years ago
An employer uses the linear regression equation mc024-1.jpg to predict the weekly salary, y, of an employee who sells x dollars
jolli1 [7]

Answer:

Alex earned about $60 more than Joaquin did.

Step-by-step explanation:


5 0
3 years ago
Other questions:
  • Explain why rational number is either a terminating or repeating decimal?
    14·2 answers
  • Just doing some work and need help
    10·1 answer
  • Adriana is thinking of a number. Her number is a factor of 30. It is an even number, but not divisible by5. Her number is not a
    13·1 answer
  • The price of an iPod dropped from $299.99 to $180.55. What was the percent decrease in price? (Round to nearest hundredth percen
    14·2 answers
  • A person's weekly pay is directly proportional to the number of hours worked. Mike's pay is $150 for 10 hours of work. Find the
    10·2 answers
  • Find the missing length. Can someone explain it to me, I would be deeply grateful.
    11·1 answer
  • HELP PLEASE math problem help!!
    9·2 answers
  • How do I solve for x plzzzz help
    5·1 answer
  • Which point could be removed in order to make the relation a function?
    5·1 answer
  • Please answer this. I need and will give
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!