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
just olya [345]
2 years ago
9

Which of the following equations have only one solution? Select all correct answers. 4x 2 + 4x = 0 x 2 + 6x + 9 = 0 9x 2 - 25 =

0 5x 2 + 20x + 20 = 0 x 2 - x - 6 = 0
Mathematics
2 answers:
Olin [163]2 years ago
7 0
The equations which have only one solution are: x²+6x+9=0 and 5x²+20x+20=0, 
Phoenix [80]2 years ago
3 0

Answer:

2nd and 4th equation will have only one solution.

Step-by-step explanation:

1). 4x² + 4x = 0

4x(x + 1) = 0

x = 0

or (x + 1) = 0 ⇒ x = -1

2). x² + 6x + 9 = 0

(x + 3)² = 0

(x + 3) = 0

x = -3

3). 9x² - 25 = 0

9x² = 25

x² = \frac{25}{9}

x = ±\sqrt{\frac{25}{9} }

x = ±\frac{5}{3}

4). 5x² + 20x + 20 = 0

5(x² + 4x + 4) = 0

(x + 2)²= 0

x + 2 = 0

x = -2

5). x² - x - 6 = 0

x² - 3x + 2x - 6 = 0

x(x - 3) + 2(x - 3) = 0

(x + 2)(x - 3) = 0

x = -2 or x = 3

Therefore, 2nd and 4th equations have only one solution.

You might be interested in
Write an inequality to model the situation.
svet-max [94.6K]

Answer:

n >21

Step-by-step explanation:

The number exceeds 21 or is greater than 21.

‘>’ represents greater than.

Let the number be n.

n >21

8 0
2 years ago
Read 2 more answers
HELPPPPPPPPPPP PLZZZZZZZZZZZZZZZZZZZZ!!!!!!!!!!!!
n200080 [17]

Answer:

x = 3

Step-by-step explanation:

The external angle of a triangle is equal to the sum of the 2 opposite interior angles.

10x + 2 is an exterior angle of the triangle, thus

10x + 2 = 2x + 1 + 25

10x + 2 = 2x + 26 ( subtract 2x from both sides )

8x + 2 = 26 ( subtract 2 from both sides )

8x = 24 ( divide both sides by 8 )

x = 3

4 0
3 years ago
Read 2 more answers
A tv that normally cost $800
sukhopar [10]

what is the question it might be an Sony-75"

6 0
2 years ago
At the end of the school year a school system has a table with the total absences and tardies in its 10 schools what is the best
enot [183]

Answer:

A

Step-by-step explanation:

3 0
2 years ago
Jerome has 5 albums with 18 baseball cards in each. His friend gives him 7 packages of Baseball cards with 13 cards in each. If
jeka57 [31]
I think it would be 232 but not sure

7 0
2 years ago
Other questions:
  • If the parent function is y = 1/x, describe the change in the equation y = - 1/x-1 - 10
    5·1 answer
  • To raise money for charity,Polly climbs the 1,776 steps in the CN Tower in Toronto,Canada.If it takes her 40 minutes to complete
    13·1 answer
  • The diagram is not to scale. What is the value of x?
    14·2 answers
  • . The coach splits a team of 27 students into 3 groups to practice skills. How many c
    15·2 answers
  • Two inches equal approximately how many centimeters?
    13·2 answers
  • Use the graph shown to answer the question. What is the solution set for the inequality if log2(2x – 1) > 2?
    6·2 answers
  • Please help me answer this!!!
    5·1 answer
  • What measure of positions divides the data into 100?
    6·1 answer
  • Part C
    15·1 answer
  • Find the perimeter. Simplify your answer.
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!