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
kupik [55]
3 years ago
5

When the solution of x2 + 9x − 9 is expressed as 9 plus or minus the square root of r, all over 2, what is the value of r? x equ

als negative b plus or minus the square root of b squared minus 4 times a times c, all over 2 times a
A: 117
B: 54
C:45
D: 9
Mathematics
2 answers:
Karolina [17]3 years ago
4 0

Answer:

A: 117

Step-by-step explanation:

I was doing the test and got this same question. the correct answer is 117.

wariber [46]3 years ago
4 0

Answer:

<u>The answer is option A. 117</u>

Step-by-step explanation:

The general solution of the quadratic equation is:

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

The given equation is x2 + 9x − 9 is expressed as minus 9 plus or minus the square root of r, all over 2

Comparing to the general solution

∴ r = determinant = b² - 4 a c  

From the given equation: a = 1 , b = 9 and c = -9

∴ r = 9² - 4 * 1 * (-9) = 81 + 36 = 117

<u>The answer is option A. 117</u>

You might be interested in
The altitude of an equilateral triangle is 5 cm. what is the length of a side of the triangle?
Grace [21]

Answer:

The length side of the triangle is \frac{10\sqrt{3}}{3}\ cm

Step-by-step explanation:

we know that

The equilateral triangle has three equal sides and three equal internal angles of measure of 60 degrees each.

Let

b------> the length side of the equilateral triangle

Applying Pythagoras theorem

b^{2}=(b/2)^{2}+5^{2}\\\\ b^{2}-(b/2)^{2}=25\\\\ (3/4)b^{2}=25\\ \\b^{2} =25*4/3\\ \\b=\frac{10}{\sqrt{3}}\ cm\\ \\b=\frac{10\sqrt{3}}{3}\ cm

3 0
4 years ago
A fluid ounce equals teaspoons. How many teaspoons are in 5 fluid ounces?
Naddika [18.5K]
I think it’s 3 that’s what I got
7 0
3 years ago
Read 2 more answers
Silver's gym charges a $65 sign-up fee and $50 per month for their membership. Solar Fitness charges a $20 sign up fee and $55 p
alexandr1967 [171]
65+50x = 55x + 20
-50x -50
65=5x+20
- 20 - 20
55=5x
55/5= 5x/5
11=x
The solution represents that it 11 months will make both gyms the exact same price.
7 0
4 years ago
Select two choices that are true about the function f(x)=23x+14/x
WINSTONCH [101]

Answer:

There is an asymptote at x = 0

There is an asymptote at y = 23

Step-by-step explanation:

Given the function:

(23x+14)/x

Vertical asymptote is gotten by equating the denominator to zero

Since the denominator is x, hence the vertical asymptote is at x = 0. This shows that there is an asymptote at x = 0

Also for the horizontal asymptote, we will take the ratio of the coefficient of the variables in the numerator and denominator

Coefficient of  x at the numerator = 23

Coefficient of x at the denominator = 1

Ratio = 23/1 = 23

This means that there is an asymptote at y = 23

8 0
3 years ago
PLEASE HELP I WILL MARK THE BRAINLIEST
-BARSIC- [3]

Given: lines l and m are parallel, and line t is a transversal.

angle pair result/justification

1 and 2 are equal (vertical angles)

6 and 8 are equal (corresponding angles)

1 and 4 are equal (alternate exterior angles)

4 and 8 are supplementary angles (i.e. add up to 180 degrees, a straight angle)

Note:

alternate angles are on opposite sides of the transversal, and each attached to a different (parallel) line.

If they are both enclosed by the parallel lines, they are alternate interior angles (examples: angles 2 and 3, 6 and 7)

If they are both outside of the two parallel lines, they are alternate exterior angles (examples: angles 1 and 4, 5 and 8)

8 0
3 years ago
Read 2 more answers
Other questions:
  • In what conditions can a factored expression be factored further?
    12·1 answer
  • What is the relationship the values of given digits like 44,000
    11·1 answer
  • I need to know the blank answer there either decimal or fraction even mix numbers
    12·1 answer
  • Which statement is true about the ray passing through points B and C?
    5·2 answers
  • 10 points! help me! <br> please! its only 1 question
    7·2 answers
  • Which set of coordinates represents a function
    7·2 answers
  • Which equation shows the relationship in the table
    15·2 answers
  • PLS HELP ASAP PLSSS IT DETECTS IF ITS RIGHT OR WRONG HELPPP
    7·1 answer
  • HELP I FARTED AND I DIDNT LIKE IT IT FEEL SQWISHY WAT DO I DO
    6·2 answers
  • Consider the function.<br> f(x) = 2 x + 12<br> What is the y-intercept of f1(x)?
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!