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
Svetllana [295]
3 years ago
14

1). If the discriminant of a quadratic equation is 28 describe the roots

Mathematics
2 answers:
Ganezh [65]3 years ago
6 0
1)B two real roots.
2)D two complex roots.
3) and 4) later
LenKa [72]3 years ago
5 0

1. Answer :B. 2 rational roots

Discriminant D >0 -----> 2 rational roots

Discriminant D =0 -----> 1 real root

Discriminant D <0 -----> 2 imaginary roots

D = 28 >0 So 2 rational roots

2. Answer : 2 complex roots

5x^2 -2x+1=0

Discriminant D =b^2 - 4*a*c= (-2)^2 -4*(5)(1) = 4 - 20 = -16

D = -16 <0 so 2 complex roots

3. 3x^2 +9=5-4x

3x^2 +9=5-4x3x^2 +4x +9-5 = 03x^2 + 4x +4  = 0

Now solve for x, use quadratic formula

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

x = \frac{-4+-\sqrt{4^2 - 4*3*4}}{2*3}

x = \frac{-4+-\sqrt{-32}}{6}

x =\frac{-4 + - 4i\sqrt{2} }{6}

x= \frac{-2 + - 2i\sqrt{2} }{3}

The roots are complex

Solution set is ( \frac{-2 + 2i\sqrt{2} }{3}  , \frac{-2 - 2i\sqrt{2} }{3} )

4. x^2-6x-5=0

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

x = \frac{-(-6)+-\sqrt{(-6)^2- 4*1*(-5)}}{2*1}

x = \frac{6+-\sqrt{56}}{2}

x = \frac{6+-2\sqrt{14}}{2}

x =3 +-\sqrt{14}

Solution set { 3 +\sqrt{14} , 3 -\sqrt{14}  )


You might be interested in
Pls help asap important assessment.
Alex73 [517]
I think The answer is A
5 0
2 years ago
I don't know what's it asking me. what should I do?
Anton [14]
n - a number
n^2 - its square
n+n^2 - the sum
\leq - less than or equal
negative three - I don't have to explain this one, do I?

n+n^2\leq-3 - the sum of a number and its square is less than or equal negative three



6 0
2 years ago
Read 2 more answers
I need help with this
Sladkaya [172]

Answer:

I believe H is the answer.

Step-by-step explanation:

Double checking.

6 0
3 years ago
What the factors of 40 with a sum of -22? *
Andru [333]

Answer:

Why is 90 the sum of all factors of 40, including 40? The factors of the number 40 are: 1, 2, 4, 5, 8, 10, 20, 40. If you add them up, you will get the total of 90.

Step-by-step explanation:

2. Given the points A, B, C, D, calculate:

(a) the angle B of the triangle ABC

(b) the area of the triangle ABC

(c) the median BE of the triangle ABC

(d) the height AH of the triangle ABC

(e) the volume of tetrahedron ABCD

(f) the point E so that ABCE is a parallelogram.

A(-1, 2, -3), B(4, -1, 0), C(2, 1, -2), D( 3,4,5)​

3 0
3 years ago
Read 2 more answers
You need to split it in half then multply then add
Harrizon [31]

Answer:

130^2 or 130 meters squared

Step-by-step explanation:

I decomposed the figure, then found the area of the decomposed figures then found the sum of them.

FIGURE A:

3 x 3 = 9

= 9^2

FIGURE B:

11 x 11 = 121

= 121 meters^2

So 121 + 9 = 130

= 130 meters^2

REMEMBER!!!!

THE FORMULA FOR AREA IS LENGTH * WIDTH = AREA

8 0
3 years ago
Other questions:
  • What the surface area
    13·1 answer
  • PLEASE HELP ME!!!!!!!
    14·1 answer
  • Write the quadratic equation in general form. (x - 3)^ 2 = 0
    15·2 answers
  • The pythagorean theorem is true for some right triangles but not all
    7·2 answers
  • Module 8. Sequences and Series Sophia has an ear infection. The doctor prescribes a course of antibiotics. Sophia is told to tak
    9·1 answer
  • If aſc and a +b = C, prove that a|b.
    8·1 answer
  • How to write four hundred two million seventy-three thousand one hundred eighty in standard form
    11·2 answers
  • This is geometry pls help will mark brainliest!!
    14·2 answers
  • Georgette balances her budget by using this plan. For every $100 she earns,
    13·1 answer
  • Write an equation of the line below.
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!