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
Elza [17]
3 years ago
13

Evaluate the expression below when x = -2. x2 − 8 x + 6

Mathematics
2 answers:
Katarina [22]3 years ago
6 0
(-2)²-8(-2)+6=4+16+6=26.
nordsb [41]3 years ago
3 0
Solve for x over the real numbers:x = -2. x^2 - 8 x + 6
Hint: | Rewrite the right hand side of the equation.-2. x^2 - 8 x + 6 = -2 x^2 - 8 x + 6:x = -2 x^2 - 8 x + 6
Hint: | Move everything to the left hand side.Subtract -2 x^2 - 8 x + 6 from both sides:2 x^2 + 9 x - 6 = 0
Hint: | Write the quadratic equation in standard form.Divide both sides by 2:x^2 + (9 x)/2 - 3 = 0
Hint: | Solve the quadratic equation by completing the square.Add 3 to both sides:x^2 + (9 x)/2 = 3
Hint: | Take one half of the coefficient of x and square it, then add it to both sides.Add 81/16 to both sides:x^2 + (9 x)/2 + 81/16 = 129/16
Hint: | Factor the left hand side.Write the left hand side as a square:(x + 9/4)^2 = 129/16
Hint: | Eliminate the exponent on the left hand side.Take the square root of both sides:x + 9/4 = sqrt(129)/4 or x + 9/4 = -sqrt(129)/4
Hint: | Look at the first equation: Solve for x.Subtract 9/4 from both sides:x = sqrt(129)/4 - 9/4 or x + 9/4 = -sqrt(129)/4
Hint: | Look at the second equation: Solve for x.Subtract 9/4 from both sides:Answer:  x = sqrt(129)/4 - 9/4 or x = -9/4 - sqrt(129)/4
You might be interested in
= Initial Knowledge Check Rewrite the expression by factoring out (y+9). 3y^2 (y + 9) + 7(y+9)​
alex41 [277]

Answer:

3y {}^{2} (y + 9) + 7(y + 9) \\  = (y + 9)(3y { }^{2}  + 7)

6 0
2 years ago
Are these lines parallel explain?
nata0808 [166]

Answer: Yes

Step-by-step explanation: hope it helps

6 0
2 years ago
Read 2 more answers
Write a math problem that includes multiplying decimals.Explain how you know where to place the decimal in the product.
disa [49]

Answer:

0.1 x 2 = 0.2

Step-by-step explanation:

when you multiply, you move the decimal once because there is one decimal place.

6 0
2 years ago
Which two integers is 42 between?<br> -8 and -7<br> -5 and -4<br> -7 and -6<br> -9 and -8
Karo-lina-s [1.5K]

Answer:

6 and 7

Step-by-step explanation:

we know that 42 will lie between 36 and 49

And 36=6; 49=7

so we can be sure that 42 lies between 6 and 7

3 0
2 years ago
Sweet tea purchased a new pair of jeans to wear to the battle of the bands on sale at 40% off.He saved 20 dollars.What was the r
MaRussiya [10]

Answer:

50

Step-by-step explanation:

50$ because 20$ is 40%, so times that by 2 which you get 20$ and 80%. Then you divide 20 by 2 then you get 10 which is 20% so you add 10 and you get 50$ which is 100%

3 0
3 years ago
Other questions:
  • 1 kilometre is how much miles​
    11·2 answers
  • What is the simplified form of the expression? √32.√24​
    6·1 answer
  • How do you solve this problem?
    5·2 answers
  • A random sample of 100 people from City A has an average IQ of 120 with a SD of 18. Independently of this, a random sample of 15
    5·1 answer
  • What is the simplified expression for 3 a squared + 9 a b + 5 minus 4 a squared minus 4 a b + 3?
    5·2 answers
  • Graph the equation c=225s+6750
    15·1 answer
  • Explain how you know that 88 is a solution to the equation 18x=11 by completing the sentences: The word "solution" means . . . 8
    8·1 answer
  • Find the measure of the angles D, E, and F<br> HELP PLZ
    15·2 answers
  • Write the equation for g(x)
    10·1 answer
  • Write this equation in slope-intercept form by isolating the y-variable.<br> 12x = 4y
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!