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
Paha777 [63]
3 years ago
7

Solve the equation by completing the square. x^2-7x-4=0. Have to show steps.

Mathematics
1 answer:
Paul [167]3 years ago
4 0
X^2-7x-4=0
(x-7/2)^2-(7/2)^2-4=0
(x-7/2)^2-(7)^2/(2)^2-4=0
(x-7/2)^2-49/4-4=0
(x-7/2)^2+(-49-4*4)/4=0
(x-7/2)^2+(-49-16)/4=0
(x-7/2)^2+(-65)/4=0
(x-7/2)^2-65/4=0
(x-7/2)^2-65/4+65/4=0+65/4
(x-7/2)^2=65/4
sqrt[ (x-7/2)^2 ]=+-sqrt(65/4)
x-7/2=+-sqrt(65)/sqrt(4)
x-7/2=+-sqrt(65)/2
x-7/2+7/2=+-sqrt(65)/2+7/2
x=7/2+-sqrt(65)/2
x=[7+-sqrt(65)]/2
x1=[7-sqrt(65)]/2
x2=[7+sqrt(65)]/2
You might be interested in
The area of a rectangular gymnasium is (5x+5x) square feet. If it is 5x feet wide, what is the length, in feet?
Amiraneli [1.4K]

Answer:

Step-by-step explanation:

Area = L x W      gym area is (5x + 5x) ft²      if   W = 5x      Find the L

Area = L x W       divide both sides by W

Area/W  = (L x W) / W

Area/W  =  L  =  Area/W

    L = Area/W

       =  (5x + 5x) / (5x)

       =  5x( 1 + 1) / 5x

       =  5x(2) / 5x                      the 5x's cancel each other  5x/5x = 1

       =   2 ft          I got 2.  I suspect the 12 was a typo and should have been 2

5 0
3 years ago
Enter the value of B when the expression 2x+B is equivalent to 2( x + 3)
PIT_PIT [208]

Answer:

Step-by-step explanation:

Esta el nino,s fuga fajita le moke

8 0
3 years ago
I need help with this onehelp me please I have to show work too
adoni [48]
Correct, because $.6 per ounce works for all of the number of ounces. Times 0.6 for all of the number of ounces on the left side (5,10,15,20) to find the result (cost of detergent)

y=.6x
8 0
3 years ago
7. Agrupa para sumar.<br>-5 +8 +(-2)​
Brums [2.3K]

Answer:

Obtendrías 1

Step-by-step explanation:

Primero resta 5 de 8 para obtener 3,

luego reste por 2 para obtener 1

¡Espero eso ayude!

6 0
3 years ago
Read 2 more answers
Can anyone help me with life?<br> I just need to talk to someone!
Mumz [18]

Answer:

You can talk to me

Step-by-step explanation:

5 0
2 years ago
Read 2 more answers
Other questions:
  • Suppose you are finding 296 divided by 4 using partial quotients. Is 50 or 70 a more reasonable partial quotient? Explain.
    11·1 answer
  • (PERSON WHO ANSWERS WILL BE MARKED BRAINLIEST) Timothy has begun selling copies of his first work of art. In the first year, he
    13·1 answer
  • 54% of 76.8 = ___ estimate
    10·1 answer
  • Can somebody help me with this question ?? :)
    13·2 answers
  • ethan allens soccer team is having a car wash the team spent $44 on supplies they earned $300 in total the teams profit is the a
    10·1 answer
  • In a large lecture class, the professor announced that the scores on a recent exam were normally distributed with a range from 5
    15·1 answer
  • HELP ASAP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    11·2 answers
  • Soleil and Malvin each work a job. Soleil starts with $700 and makes $100 per day. Malvin starts out with $200 and makes $120 pe
    7·1 answer
  • How do i do this. will give brainliest
    5·1 answer
  • Carrie spent
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!