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
jolli1 [7]
4 years ago
13

Use quadratic formula solve .7x^2 - 28x - 7​

Mathematics
1 answer:
beks73 [17]4 years ago
6 0

Answer:

x = 2 + sqrt(5) or x = 2 - sqrt(5)

Step-by-step explanation using the quadratic formula:

Solve for x over the real numbers:

7 (x^2 - 4 x - 1) = 0

Divide both sides by 7:

x^2 - 4 x - 1 = 0

Add 1 to both sides:

x^2 - 4 x = 1

Add 4 to both sides:

x^2 - 4 x + 4 = 5

Write the left hand side as a square:

(x - 2)^2 = 5

Take the square root of both sides:

x - 2 = sqrt(5) or x - 2 = -sqrt(5)

Add 2 to both sides:

x = 2 + sqrt(5) or x - 2 = -sqrt(5)

Add 2 to both sides:

Answer:  x = 2 + sqrt(5) or x = 2 - sqrt(5)

You might be interested in
Please simplify each expression for 18, 20, and 21
NeX [460]
The answer to the questions

5 0
4 years ago
Slove equations with variables on both sides9 + 3f = 2f
Vera_Pavlovna [14]

Given 9 + 3f = 2f

9 = 2f - 3f

9 = -f

f = -9

4 0
1 year ago
Mrs.Davis bought 6 pounds of grapes for 18 dallors at this rate how much would 72 ounces of grapes have cost
harkovskaia [24]

Answer:

Cost of 72 ounces of grapes is $13.5


Step-by-step explanation:

In order to solve his problem, we first need to get all the values in the same units.

  1 pound = 16 ounces

∴ 6 pounds= 16×6 = 96 ounces

Now by unitary method, we solve the question as follows:

price of 96 ounces of grapes = $ 18

price of 1 ounce of grapes = $ (18÷96)

∴ price of 72 ounces of grapes = $ [(18÷96)×72]

= (0.1875×72) =  $ 13.5

4 0
3 years ago
(60 POINTS) Given parallelogram
Serjik [45]

Answer:

123re Counterclockwise rotated

S

3 0
2 years ago
Read 2 more answers
Help me please 12 and f
zimovet [89]

Answer:

It is not equivalent.

Step-by-step explanation:

You have to expand the brackets :

(x-4)(x+3)

= x(x) + x(3) - 4(x) - 4(3)

= x² + 3x - 4x - 12

= x² - x - 12

Therefore, x² - x - 12 / (x-4)(x+3) is not equivalent to x² - 4x - 12.

6 0
3 years ago
Other questions:
  • How do I Simplify 9(5x)
    12·2 answers
  • What is the color for 1.99 for goodwill tomorrow?
    12·1 answer
  • Two rational numbers between -1 and 0
    11·2 answers
  • What is 100 and a long division divided by six
    5·2 answers
  • Solutions of x2 + 13x + 30 = 0 by factoring.
    14·1 answer
  • 20 men can complete the construction of a road in 30 days. If 5 more men join the team,In how many days will the work be over?
    15·1 answer
  • To prove that the triangles are similar by the SSS similarity theorem, which other sides or angles should be used?]
    13·2 answers
  • Real life example of when we use unit rates)(HELP ASAP I’ll give brainliest have a good day:)
    9·1 answer
  • A rectangle and a triangle have the same area and the same base measurement. How does the height of the triangle compare to the
    14·1 answer
  • I need help with this please
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!