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
Misha Larkins [42]
1 year ago
15

2x^2+8x-3=-1 Solve by completing the square.

Mathematics
1 answer:
algol131 year ago
8 0

Answer:

step 1. Halve everything

x^2+ 4x - 0.5 = 0

step 2. Halve the coefficient of x so you can write down an equivalent for x² + 4 (that is, (x + 2)^2 - 4 )

(x + 2)² - 4.5 = 0

step 3. Isolate the squared term:

(x + 2)^2 = 4.5

step 4. Take square roots of both sides, recognising that a square root can be positive or negative:

x + 2 = ±√4.5

step 5. Make x explicitly

x = -2 ±√4.5

And there you are with two solutions.

Step-by-step explanation:

hope this helps if not let me know have a great day

You might be interested in
A store owner is interested in opening a second shop. She wants to estimate the true average daily revenue of her current shop t
Alex
Every confidence interval has associated z value. As confidence interval increases so do the z value associated with it. 
The confidence interval can be calculated using following formula:
\overline{x} \pm \frac{zs}{\sqrt n}
Where \overline{x} is the mean value, z is the associated z value, s is the standard deviation and n is the number of samples.
We know that standard deviation is simply a square root of variance:
s=\sqrt{315900.20}=\$562.05
The confidence interval of 95% has associated z value of <span>1.960.
</span>Now we can calculate the confidence interval for our income:
3472.00\pm \frac{1.960\cdot 562.05}{\sqrt{60}}\\ \$3472.00\pm142.22


6 0
3 years ago
Leena knits 10 rows in 12 min. At this pace, how long will it take her to knit the next 25 rows?
tatiyna
For 10 rows, she takes = 12 min.
So, for 1 row, she'll take = 12/10 

Now, for 15 rows, it would be: 12/10 * 25 = 12/2 * 5 = 60/2 = 30

So, Your Final Answer would be 30 minutes

Hope this helps!
7 0
3 years ago
Read 2 more answers
A grocer wants to mix a type of spice which costs £22 per kilogram with another type
AfilCa [17]

Answer:

60

Step-by-step explanation:

let a = 22 / kg, and b = 12 / kg

a + b = 20 kg

22a + 12b = 15 * 20

12a + 12b = 240

10a = 60

8 0
2 years ago
Which equation does the graph represent?
Art [367]

Answer:

It is the second answer

Step-by-step explanation:

The standard form of an ellipse is

x^2/a^2 + y^2/b^2  or x^2/b^2 + y^2/a^2 = 1

If the x is the main axis we use the first form.  If the y is the main axis we use the second form.  We will use the second form.

our a is 3 and our b is 4

x^2/3^2 + y^2/4^2

3 0
1 year ago
What is the value of
Len [333]

n-2=10n+42\qquad\text{add 2 to both sides}\\\\n=10n+44\qquad\text{subtract 10n from both sides}\\\\-9n=44\qquad\text{divide both sides by (-9)}\\\\\boxed{n=-\dfrac{44}{9}}

8 0
3 years ago
Read 2 more answers
Other questions:
  • Which is a perfect square<br> 61<br> 62<br> 63<br> 64
    5·1 answer
  • Find the surface area of the square pyramid using its net.
    6·1 answer
  • A boarding kennel mixes dry dog ​
    13·1 answer
  • CAN SOMEONE PLEASE HELP ME OUT ON THIS QUESTION PLEASE!!!! I WILL GIVE BRAINLIEST!!! I HAVE TO TURN THIS IN, IN AN HOUR!!!!
    9·1 answer
  • How do you solve for x in the equation 4x-2(x-2)=-9+5x-8
    13·1 answer
  • ) The density of oil in a circular oil slick on the surface of the ocean at a distance of r meters from the center of the slick
    6·1 answer
  • Simplify:<br> (x-2) (x^2-3x+7)
    15·2 answers
  • Hello! Please answer this question with all of the info it is asked for. Please be sure to include all of your work and share an
    13·1 answer
  • Which graph represents function f?<br> f(x) = (1/3)^x
    6·1 answer
  • I also need someone to help me with this also
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!