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
Vika [28.1K]
2 years ago
15

What does k^2 -8k-20=0

Mathematics
2 answers:
Karolina [17]2 years ago
7 0
k^{2}-8k-20=0 \\ (k-10)(k+2)=0 \\  \\ k-10=0 \\ k=10 \\  \\ k+2=0 \\ k=-2 \\  \\ \boxed{k=-2\ and\ 10}
victus00 [196]2 years ago
3 0
K² - 8k - 20 = 0
k = <u>-(-8) +/- √((-8)² - 4(1)(-20))</u>
                       2(1)
k = <u>8 +/- √(64 + 80)</u>
                 2
k = <u>8 +/- √(144)
</u>              2<u>
</u>k = <u>8 +/- 12</u><u>
</u>            2
k = <u>8 + 12</u>          k = <u>8 - 12</u>
          2                        2
h = <u>20</u>                k = <u>-4</u>
       2                        2
x = 10                k = -2
<u />
You might be interested in
Please help me I need it.
Elina [12.6K]

Answer:

NOPE

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
In the diagram, R, S, and T are all points of tangency. What is the perimeter of Triangle<br> XYZ?
Molodets [167]

Answer:

54 cm

Step-by-step explanation:

Perimeter = TZ + TX + RX + RY + SY + SZ

TZ = 5 cm

TX = 13 cm

RY = 9 cm

RX = TX = 13 cm (tangents drawn from and external point)

SY = RY = 9 cm (tangents drawn from and external point)

SZ = TZ = 5 cm (tangents drawn from and external point)

Plug in the values:

Perimeter = 5 + 13 + 13 + 9 + 9 + 5 = 54 cm

7 0
2 years ago
In each of the following equations, what is
timama [110]

The graph will cross at the coordinates (-2, 9)

<h3>How to solve equations?</h3>

y = 3x + 15

y = 3 - 3x

y = 3x + 15

Hence,

when x = 2

y = 3(2) + 15 = 21

when x = 0

y = 3(0) + 15 = 15

y = 3 - 3x

when x = 2

y = 3 - 3(2)

y = 3 - 6

y = -3

when x = 0

y = 3 - 3(0)

y = 3

Therefore, let's check if the equation will cross.

y = 3x + 15

y = 3 - 3x

using substitution,

3 - 3x = 3x + 15

3  - 15 = 3x + 3x

- 12 = 6x

x = -12 / 6

x = -2

y = 3 - 3(-2)

y = 3 + 6

y = 9

Therefore, the graph will cross at the coordinates (-2, 9)

learn more on equations here: brainly.com/question/19297665

#SPJ1

8 0
1 year ago
What is the equation of a line with a slope of 2 and a y-intercept of -5?
RSB [31]
Y=2x-5

Hope this helps ya :D
7 0
2 years ago
Please help using the picture below I need the surface area I also need an explanation
Taya2010 [7]

Answer:

155

Step-by-step explanation:

5*5=25

((5*13)/2)*4=130

130+25=155

6 0
2 years ago
Other questions:
  • What does this equation equal??? -2/3×2 3/4
    15·1 answer
  • Standard form of this equation
    14·2 answers
  • Which of the following is a step in simplifying the expression-
    14·2 answers
  • What makes an irrational number irrational?
    11·2 answers
  • A graph of a quadratic function is shown below.
    9·1 answer
  • ( 3.42 x 10^-7 ) ( 7.5 x 10^-6 ) in standard form
    7·1 answer
  • X is on line WY. Find the value of b.
    9·2 answers
  • HELP!! THIS IS A CRY FOR HELPPPPPP!<br> 5x-4+3 Simplifies to...?<br> Tysm if you answer!!!!!!
    9·2 answers
  • The table and the graph below each show a different relationship between the same two variables, x and y.
    9·2 answers
  • PLS ANSWER IM MARKING BRAINLEST IF YOU CORRECT
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!