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
ivann1987 [24]
3 years ago
5

How do you work out this problem using completing the square x2 - 4x - 80 = 0

Mathematics
2 answers:
Ugo [173]3 years ago
7 0

x^2 - 4x = 80

x^2 - 4x + 4 = 80 + 4 (Divide b, which is 4, by 2 and square it.)

x^2 - 4x + 4 = 84

sqrt(x + 2)^2 = sqrt(84)

x + 2 = plus or minus sqrt(84)

Subtract 2 from both sides

x = -2 plus or minus sqrt(84)

yulyashka [42]3 years ago
3 0

Answer:

A value that satisfies this equation is called a root, zero or solution of the equation!! We have three ... Solve each by factoring. 1) x2 + 4x -5 = 0 ... Follow the explanation and sample problem to review completing the square.

Step-by-step explanation:

You might be interested in
Sally left the city for vacation. Sara left 5 hours later going 58 mph faster to catch up.
tensa zangetsu [6.8K]

Answer:46.2

Step-by-step explanation:

hope this helps

6 0
2 years ago
If (x) = 3x - 5 and g(x) = x + 3, find (f - g)(x).
Temka [501]

Answer:

2x -8

Step-by-step explanation:

f (x) = 3x - 5

g(x) = x + 3,

(f - g)(x) = 3x - 5 - ( x+3)

Distribute the minus sign

            = 3x-5 -x-3

Combine like terms

           = 2x -8

8 0
3 years ago
Read 2 more answers
What is the solution of this equation -6+5x=6x-7
fomenos

Answer:

x = 1

Step-by-step explanation:

Our goal is to isolate x on one side. So:

-6 +5x = 6x - 7

-6 = x - 7

1 = x

Hope that helped!

5 0
3 years ago
Which models best illustrates the inequality and its graph? t ≥ 60
Dmitry [639]

It will be the model that has the arrow going to the right with the starting point at 60 having a solid circle.

7 0
3 years ago
How can I solve?<br><br> Solve for x (hint - use the quadratic formula)
ladessa [460]

Answer:

X1= -7     X2=5

Step-by-step explanation:

It would be greatly appreciated if you gave me brainlest

6 0
3 years ago
Read 2 more answers
Other questions:
  • Use the expression 5(6 + 4x) to answer the following:
    5·1 answer
  • Help me please please
    11·1 answer
  • Helppp mee!!!!!!!!!!!
    11·2 answers
  • What property would justify the following statement? If a = b and b = c, then a = c. Addition Property Reflexive Property Subtra
    8·1 answer
  • Draw an angle of negative pie over three in<br> Standard position.
    15·1 answer
  • Arrange the following in increasing order 14.204 14.200 14.240 14.210
    11·2 answers
  • W-(-3)=18 what is w<br>subtracting intergers
    12·2 answers
  • You have 40 minutes to exercise at the gym, and you want to burn 300 calories total using both
    14·1 answer
  • at shop and shop ,shaquana buys 3 pounds of squash and 2 pounds of eggplants and pays $2.85.then ,evelyn buys 4 pounds of squash
    7·1 answer
  • 1. Given a right circular conea) What is the shape of a cross section parallel to the base of the cone?b) what is the shape of a
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!