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
EleoNora [17]
3 years ago
9

One of the roots of the equation x^2 + kx -6 = 0 is 3, and k is constant

Mathematics
1 answer:
Aleks [24]3 years ago
8 0
In order to solve this problem, we need to use the factor and remainder theorem. Suppose we have a quadratic equation of Q(x) and a binomial x-a=0, where a is a constant such that x=a. When you substitute x=a to the quadratic equation, you use the answer as basis. Whatever the answer is, is the remainder. If the answer is zero, that means that x=a is a factor. 

In this case, we substitute x=3 to the quadratic equation and equate to zero to find k.

Q(x) = x²+kx-6
Q(3) = 3²+k(3)-6 = 0
k = -1

The value of k is -1.
You might be interested in
Simplify: -4b^6 + (-26b^6)
DENIUS [597]

Answer:

-30b^{6}

Step-by-step explanation:

-4b^6 + -24b^6 = -30b^6

7 0
3 years ago
The ratio of boys to girls in a school is 5:4. if there are 500 girls , how many boys are there in the school?
lana [24]

Answer:

The number of boys in the school is;

625

Explanation:

Given that the ratio of boys to girls in a school is 5:4;

5\colon4

And there are 500 girls in the school.

The number of boys in the school will be;

\begin{gathered} \frac{B}{G}=\frac{5}{4} \\ G=500 \\ B=\frac{5\times G}{4}=\frac{5\times500}{4} \\ B=625 \end{gathered}

Therefore, the number of boys in the school is;

625

3 0
1 year ago
If a consumer takes out a $100 payday loan, his total cost will be higher because of
Zolol [24]

Answer:

being smart

Step-by-step explanation:

4 0
2 years ago
ive been stuck on this question for a while :( i was absent for the first half of this lesson so i dont completely know what im
Deffense [45]

Answer:

(0, 9 ) and (- 4, 1 )

Step-by-step explanation:

To determine which ordered pairs lie on the graph substitute the x- coordinate of the point into the right side of the equation and compare the value obtained with the y- coordinate

(- 20, - 49 )

2x + 9 = (2 × - 20) + 9 = - 40 + 9 = - 31 ≠ - 49

(1, 10 )

2x + 9 = (2 × 1) + 9 = 2 + 9 = 11 ≠ 10

(0, 9 )

2x + 9 = (2 × 0) + 9 = 0 + 9 = 9 ← point lies on graph

(- 4, 1 )

2x + 9 = (2 × - 4) + 9 = - 8 + 9 = 1 ← point lies on graph

(- 3, 40 )

2x + 9 = ( 2 × - 3) + 9 = - 6 + 9 = 3 ≠ 40

5 0
3 years ago
PLEASE ANSWER IF YOU CAN Cameron did 4 jumping jacks on Wednesday, 9 jumping jacks on Thursday, 19 jumping jacks on Friday, and
Blizzard [7]

Answer:

My answer is 64

Step-by-step explanation:

How I got my answer is that you write the numbers and the difference of the each 2 numbers. When you see the pattern is 5, 10, 20, and it might as well be 25 because you are going to start all over with the pattern

6 0
3 years ago
Read 2 more answers
Other questions:
  • HELP! LOOK AT THE IMAGES BELOW
    6·1 answer
  • Write 5.2 as the quotient of two integers.
    8·2 answers
  • a savings account balance is compounded continuously. If the interest rate is 3.1% per year and the current balance is $1077.00,
    10·1 answer
  • I just need help I’ll be waiting for a while thank you to helps
    12·1 answer
  • Goods available for sale are $40000, beginning inventory is $16000, ending inventory is $20000, the cost of goods sold $50000, w
    10·1 answer
  • chlorine is a gas for all temperatures greater than -31*F. If F represents temperature in degrees Fahrenheit, the inequality F&g
    10·1 answer
  • Module Quiz: Modified
    7·1 answer
  • Help- i dont know what it is at all
    14·1 answer
  •  please help me I’ll give you brainiest it’s for a test
    10·1 answer
  • I need help with this 1 problem on my homework
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!