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
Vedmedyk [2.9K]
3 years ago
12

If one of the roots of the quadratice quation x2+kx-12=0is4,what is the value of k?

Mathematics
2 answers:
IceJOKER [234]3 years ago
5 0

Answer:

k = - 1

Step-by-step explanation:

Given that x = 4 is a root then, substitute x = 4 into the equation.

4² + 4k - 12 = 0

16 + 4k - 12 = 0, that is

4k + 4 = 0 ( subtract 4 from both sides )

4k = - 4 ( divide both sides by 4 )

k = - 1

uysha [10]3 years ago
3 0
<h3>Given Equation:</h3>

\huge \purple {\rm { {x}^{2}  + kx - 12 = 0}}

<h3>Value:</h3>

\huge \purple {\rm {x = 4}}

<h3>To Find:</h3>

\huge \purple {\rm {The \: value \: of \: k.}}

<h3>Solution:</h3>

\huge \purple {\rm { {(4)}^{2}  + k(4) - 12 = 0}}

\huge \purple {\rm {or, \: 16 + 4 k - 12 = 0}}

\huge \purple {\rm {or, \: 4k =  - 4}}

\huge \purple {\rm {or, \: k =  \frac{ - 4}{4}  =  - 1}}

<h2>Answer:</h2>

\huge \purple {\sf {The \: value \: of \: k \: is \: -1}}

You might be interested in
Hii pls help i’ll give brainliest if you give a correct answer
iragen [17]

Hey there ..

Ur answer .. Check it out ..

Plz mark me as brainliest ..

3 0
2 years ago
Help pls thanks again sorry to all people that is getting disturbed
Ierofanga [76]

Answer:

Just follow the arrow or see answer in each box

Step-by-step explanation:

5 0
3 years ago
Emily is 4 times as old as Tiffany. In ten years time, Emily will be twice as old as Tiffany . Find their ages.​
Sholpan [36]
<h3><u>Question</u><u>:</u></h3>

Emily is 4 times as old as Tiffany. In ten years time, Emily will be twice as old as Tiffany. Find their ages.

<h3><u>Solution</u><u>:</u></h3>
  • Let the age of Tiffany be x years.
  • Then, the age of Emily = 4x years.
  • After 10 years, the age of Tiffany will be (x+10) years.
  • After 10 years, the age of Emily will be (4x+10) years.
  • Therefore, by the problem

4x + 10 = 2(x + 10) \\  = 4x + 10 = 2x + 20 \\   = > 4x - 2x = 20 - 10 \\  =  > 2x = 10 \\  =  > x =  \frac{10}{2}  \\  =  > x = 5

  • So, Tiffany's present age = 5 years.
  • Emily's present age = (4×5) years = 20 years.
<h3><u>Answer:</u></h3>

Emily's age is 20 years and Tiffany's age is 5 years.

Hope it helps!

7 0
2 years ago
Read 2 more answers
Expand 3( q + 2 )<br> 3(q + 2) =
adoni [48]

Answer:

9q²+36+36q

Step-by-step explanation:

3( q + 2 ) *3(q + 2) =9*((q+2)²)=9*(q²+4+4q)=9q²+36+36q

6 0
2 years ago
Whats the unit rate of 122 and 4?
ANTONII [103]

Answer: 30.5

Step-by-step explanation:

30.5 times 4 equals 122

5 0
3 years ago
Other questions:
  • 3(y−1.5)=9.9–4.2y Please help. Solve for y
    8·1 answer
  • Why does the fact family for 81 and 9 have only two number sentences
    5·2 answers
  • Find the perimeter of the parallelogram with these vertices.<br> (-2, 2), (-2,-2), (3,-2), (3, -6)
    8·1 answer
  • A survey is taken among customers of a fast-food restaurant to determine preference for hamburger or chicken. Of 200 respondents
    6·1 answer
  • At a local preschool, there is a ratio of 3 boys to every 4 girls. If there are 245 total preschoolers enrolled, then how many a
    8·2 answers
  • Determine the value of c that will result in a perfect square trinomial. <br> w^2+6w+ c =130+c
    13·1 answer
  • If is an angle in quadrant II, what is the value of ?
    13·1 answer
  • PLEASE HELP!!!! WILL GIVE BRAINLIEST!!!!
    10·1 answer
  • Tayla purchased a large box of comic books for $300. She gave 15 of the comic books to her brother and then sold the rest on an
    13·1 answer
  • Simplify 10 divide 5 + 3 x 2.
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!