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
evablogger [386]
2 years ago
9

How to solve x^2+x-90=0 in completing the square method​

Mathematics
1 answer:
tigry1 [53]2 years ago
3 0

Rearrange the equation by writing

x² + x - 90 = 0

x² + x = 90

x² + x + 1/4 = 90 + 1/4

Recall that (a + b)² = a² + 2ab + b². Then

x² + 2 • x/2 + (1/2)² = 361/4

(x + 1/2)² = 361/4

x + 1/2 = ± √(361/4)

x = -1/2 ± 19/2

x = 9   or   x = -10

You might be interested in
If x=2, y=3 and z=1 then find the value of <br> 1/2 x + 3/4 y
Nuetrik [128]

Answer:

1 1/4

Step-by-step explanation:

x=2, y=3, and z=1

1/2(2)+3/4(3)=1+3/12=1 1/4

7 0
3 years ago
Read 2 more answers
. A grocery store clerk put only packages of flour tortillas and packages of corn tortillas on a shelf. The ratio of the number
KengaRu [80]

Answer: It should be 18...(Multiple of 9)

Step-by-step explanation:

3 0
3 years ago
PLEASE HELP MEEEEEE<br><br> f(x)=4x + 5<br> f (-3)
Dafna1 [17]

Answer:

evaluate the function with -3 as x value

Step-by-step explanation:

4(-3) + 5

-12 + 5

= -7

7 0
3 years ago
Read 2 more answers
(02.05 MC) A dance school has 63 ballet dancers. If 42% of the total number of dancers in the school are ballet dancers, what is
Elena L [17]

Alright, lets get started.

Suppose total number of dancers in school = x

We have given in question, 42 % of total dancers are ballet dancers.

So, we could find number of ballet dancers by finding 42 % of total dancers.

Number of ballet dancers = x * 42 %

Number of ballet dancers = x * 42/100 = 0.42 x

As per given in question, there are 63 ballet dancers in school.

Which means 0.42 x = 63

Dividing 0.42 from both sides

0.42 x / 0.42 = 63 / 0.42

x = 150

Hence number of total dancers in school = 150 : Answer

Hope it will help :)

4 0
3 years ago
The following data show the weight, in ounces, of 10 different bags of candy:
LuckyWell [14K]
B) is correct; on average, each bag of candy has a weight that is 2.6 oz different than the mean weight of 5 oz.

To find the mean absolute deviation, we first find the mean.  Find the sum of the data points and divide by the number of data points (without the outlier, 21, in it):
(10+3+7+3+4+6+10+1+2+4)/10 = 50/10 = 5

Now we find the difference between each data point and the mean, take its absolute value, and find their sum:
|10-5|+|3-5|+|7-5|+|3-5|+|4-5|+|6-5|+|10-5|+|1-5|+|2-5|+|4-5| =
5+2+2+2+1+1+5+4+3+1 = 26

We now divide this by the number of data points:
26/10 = 2.6

This is a measure of how much each bag of candy varies from the mean.
4 0
3 years ago
Read 2 more answers
Other questions:
  • Job A pays an annual salary of $17,500 while job B pays $18,000. The taxpayer choosing between the 2 jobs files his federal inco
    13·1 answer
  • Please help easy math anyne could do it exexpt for me cuz im dumb
    13·2 answers
  • The people of Whoville were shopping like crazy to get their lists completed! one customer bought a wreath for $12 and seven orn
    10·2 answers
  • How to solve 18 + 3(9f-13)
    8·2 answers
  • How do I do 9b and 9c<br>I already know the volume is 27.47m3
    10·1 answer
  • If each interior angle of a regular polygon measures 168º, how many sides does the polygon have?
    15·1 answer
  • Please help i will give brainliest
    11·2 answers
  • HELP!!!
    8·1 answer
  • What is the area of a circle with a radius of 4 inches?
    10·2 answers
  • Aaron's car used 3- gallons of gas when
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!