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
ladessa [460]
3 years ago
11

Solve by using the quadratic formula: x^2 - 6x + 7 = 0 Please enter any square root values using "sqrt" or the decimal answer ro

unded to the nearest hundredth (i.e. V2 = sqrt(2) or 1.41).​
Mathematics
1 answer:
olga nikolaevna [1]3 years ago
6 0

Given parameters:

 Quadratic expression:

                 x² - 6x + 7 = 0

Solve using quadratic formula;

                      x   = \frac{-b +/- \sqrt{b^{2 } - 4ac} }{2a}

From the equation;

  a  = 1, b = -6 and c = 7

Input the parameters and solve;

           x = \frac{-(-6) +/- \sqrt{-6^{2 } + 4 x 1 x 7 } }{2 x 1}

          x = \frac{6 +/- \sqrt{36} +28 }{2}

        x = \frac{6 +/- \sqrt{64} }{2}

          x = \frac{6 + 8}{2 }    or \frac{6-8}{2}

          x = 7 or -1

         

You might be interested in
When Andrei surveyed 36 random seventh-grade students in the lunchroom, he found that 7 out of 9 would like to try or have
Alex73 [517]

Answer:

About 630 seventh-grade students would like to snorkel

Step-by-step explanation:

if you do

7/9 x 90 equals 630/810 total students

7 0
3 years ago
Arithmetic mean between -2 and 58
lions [1.4K]

Answer:

I think its true

Step-by-step explanation:

8 0
3 years ago
Find the better buy plz quick
Nana76 [90]
It's letter c 89 cents
4 0
3 years ago
Read 2 more answers
What is 9 to the of 3
MrRa [10]

Answer:

729

Step-by-step explanation:

8 0
2 years ago
Work out the formula of the nth term in the following quadratic sequence:<br> 19, 15, 9, 1...
Butoxors [25]

In a quadratic sequence we'll get a linear first difference and a constant second difference.  Let's verify that.

n          1   2   3   4

f(n)       19  15  9   1

1st diff   -4  -6  -8

2nd diff     2   2

We see that we got a constant second difference.  We could just extend that and work back up to get more values.

n          1   2   3   4       5    6      7

f(n)       19  15  9   1      -9   -21   -35

1st diff   -4  -6  -8   -10  -12   -14

2nd diff     2   2    2     2    2

That's just an aside; we're after the general formula.  We have

f(1)=19, f(2)=15, f(3)=9

In general we can assume

f(n) = an²  + bn + c

We get three equations in three unknowns,

19 = a(1²)+b(1)+c = a+b+c

15 = a(2²) + b(2) + c = 4a + 2b + c

9 = a(3²) + b(3) + c =  9a + 3b + c

That's a 3x3 linear system; it's easy to solve directly.  Subtracting pairs,

4 = -3a - b

6 = -5a - b

Subtracting those,

-2 = 2a

a = -1

b = -3a -4 = -1

c = 19-a-b = 21

Answer: f(n) = -n² - n + 21

Check:

f(1) = -1 - 1 + 21 = 19, good

f(2) = -4 - 2 + 21 = 15, good

f(3) = -9 - 3 + 21 = 9, good

f(4) = -16 - 4 + 21 = 1, good

Let's check our extended table, how about

f(7)= -49 - 7 + 21 = -35, good

6 0
3 years ago
Other questions:
  • Does a negative minus a negative equal positive
    10·2 answers
  • What 2d shapes make up a sphere and a cone
    6·1 answer
  • Which fractions are less than 8/12?
    10·1 answer
  • Ve a reason why an object with a base toppleasily the one with​
    14·1 answer
  • Ndelaria estimates that the drama club sold 400 tickets to the school play. The
    9·1 answer
  • Si un proyectil asciende verticalmente, y después de 3 segundos alcanza su altura máxima, calcule la velocidad que lleva a la mi
    9·1 answer
  • There are 14 rows of seats in a cinema.
    7·1 answer
  • If i= -1, what is the value of i3?<br> O-1<br> Ο i <br> O 1<br> O -i
    13·1 answer
  • Find the missing angle​
    6·1 answer
  • What is the slope of this line?
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!