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
VMariaS [17]
2 years ago
13

3.1 Factorise completely3.1.2 3x2 - 2x - 8​

Mathematics
2 answers:
Ugo [173]2 years ago
7 0

Answer:

3x² – 2x – 8

=> 3x² – 6x + 4x – 8

=> 3x( x – 2 ) + 4( x – 2 )

=> ( 3x + 4 ) ( x – 2 )

Therefore,

Either, 3x + 4 = 0

3x = - 4

x = - 4/3 (Ans)

And,

x – 2 = 0

x = 2 (Ans)

Svet_ta [14]2 years ago
4 0

Answer:

(x - 2)(3x + 4)

Step-by-step explanation:

Given

3x² - 2x - 8

Consider the factors of the product of the coefficient of the x² term and the constant term which sum to give the coefficient of the x- term.

product = 3 × - 8 = - 24 and sum = - 2

The factors are - 6 and + 4

Use these factors to split the x- term

3x² - 6x + 4x - 8 ( factor the first/second and third/fourth terms )

= 3x(x - 2) + 4(x - 2) ← factor out (x - 2) from each term

= (x - 2)(3x + 4)

You might be interested in
PYTHAGORAS THEROM AND TRIGONOMETRY RATIO​
marysya [2.9K]

Answer:

1) ΔACD is a right triangle at C

=> sin 32° = AC/15

⇔ AC = sin 32°.15 ≈ 7.9 (cm)

2) ΔABC is a right triangle at C, using Pythagoras theorem, we have:

AB² = AC² + BC²

⇔ AB² = 7.9² + 9.7² = 156.5

⇒ AB = 12.5 (cm)

3)  ΔABC is a right triangle at C

=> sin ∠BAC = BC/AB

⇔ sin ∠BAC = 9.7/12.5 = 0.776

⇒ ∠BAC ≈ 50.9°

4) ΔACD is a right triangle at C

=> cos 32° = CD/15

⇔ CD = cos32°.15

⇒ CD ≈ 12.72 (cm)

Step-by-step explanation:

7 0
2 years ago
What is y=2(x+1)^2 in standard form
Setler79 [48]
Y=4x+4
I think this is it u just have to simplify to get it to y=mx+b
5 0
3 years ago
Read 2 more answers
In circle C, r = 32 units.
vlabodo [156]
Probably 2561 but since area equal r^2 I thought it would be 3217
5 0
2 years ago
If 18 is subtracted from twice the square of an integer, the
Sergeu [11.5K]

Answer:

-3/2

Step-by-step explanation:

Let x = the integer:

2x^2 - 18 = 9x

2x^2 - 9x - 18 = 0

Now either factor that or use the quadratic formula if you're lazy like me.

x = -3/2 and 6, so x must be 6 because it has to be an integer.

5 0
2 years ago
a can contain 15/16 pound of vegetables . one serving of these vegetables weights 1/4 pound . whats is the total number of servi
Elodia [21]
1/4=4/16 so the can has 3 servings and a some leftovers that are smaller than a serving. I think the answer is 3.
5 0
3 years ago
Other questions:
  • A patients medication is decreased 25 milligrams per day for one week what is the number of change
    9·1 answer
  • *Need help asap*
    8·1 answer
  • How do u divide fractions
    10·1 answer
  • Does anyone know what the slope should be
    8·1 answer
  • 6
    10·1 answer
  • HELP!!! <br> I need to know if this is Function or not a function.
    13·1 answer
  • Dylan is driving to a concert and needs to pay for parking. There is an automatic fee
    12·2 answers
  • Which expression is equivalent to…
    6·1 answer
  • Will mark the brainliest
    5·1 answer
  • The product of a number n and 2 is 2 what is the equation
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!