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
Elza [17]
3 years ago
15

How do you factor quadratics by grouping

Mathematics
1 answer:
Kaylis [27]3 years ago
5 0
Here's an example Its also call the 'ac' method:-

factor  2x^2 - 13x - 15

Multiply first coefficient by last number  which is 2*-15 = -30

Now we need 2 factors of -30 which will when added give - 13:-

-15 and 2  looks good. So we  can write:-

2x^2 - 13 x - 15

= 2x^2 + 2x - 15x - 15 

factor by grouping first 2 and last 2 terms , we get:-

= 2x(x + 1) - 15(x + 1)   

the x+1 is common so we have:-

(2x - 15)(x + 1)   Answer

Hope this helps.


You might be interested in
What is the value of x?<br><br> A. -9<br> B. -10<br> C. 10<br> D. -12
kirza4 [7]

Answer:

A -9

Step-by-step explanation:

6 0
3 years ago
A stand at a farmer's market sells different types of apples, as shown in the table.
son4ous [18]

Answer:

Step-by-step explanation:

Apple B Cost

6 0
2 years ago
Will mark BRAINLIEST to correct answer! Please help, this has to be correct. Thanks!
pogonyaev
The answer would be 314.16 square cm
Hope this helps! :)
4 0
3 years ago
Read 2 more answers
The radius of the base of a cylinder is decreasing at a rate of 121212 kilometers per second. The height of the cylinder is fixe
WARRIOR [948]

Answer:

7536 km^3/sec

Step-by-step explanation:

Given that:

Rate of decreasing of radius = 12 km/sec

Height of cylinder is fixed at = 2.5 km

Radius of cylinder = 40 km

To find:

The rate of change of Volume of the cylinder?

Solution:

First of all, let us have a look at the formula for volume of a cylinder.

Volume = \pi r^2h

Where r is the radius and

h is the height of cylinder.

As per question statement:

r = 40 km (variable)

h = 2.5 (constant)

\dfrac{dV}{dt} = \dfrac{d}{dt}\pi r^2h

As \pi, h are constant:

\dfrac{dV}{dt} = \pi h\dfrac{d}{dt} r^2\\\Rightarrow \dfrac{dV}{dt} = \pi h\times 2 r\dfrac{dr}{dt} \\$Putting the values:$\\\Rigghtarrow\dfrac{dV}{dt} = 3.14 \times 2.5\times 2 \times 40\times 12 \\\Rigghtarrow\dfrac{dV}{dt} = 7536\ km^3/sec

4 0
3 years ago
Jenny has a new box of 8 colored pencils. Each one is perfectly sharpened. Together the colored pencils have a mass of 56 grams
storchak [24]

Answer:

If you are trying to find how much grams are in one color pencil it is 7 grams.

8 0
2 years ago
Other questions:
  • Using a picture, show house six people could share for sandwiches. Then, write an equation and solve.
    9·1 answer
  • Please help I have a test tomorrow and I really need to study the pic is on top
    8·2 answers
  • What is the length of leg s of the triangle below
    13·2 answers
  • A circle has an area of 81pi square units. What is the diameter of the circle
    5·2 answers
  • Solve.
    10·2 answers
  • Evaluate -2x 2y, if x = -3 and y = -1. -12 18 -18 12
    15·1 answer
  • Help with this task it's confusing can u explain how you got the answer
    8·1 answer
  • Can someone help me out with this?
    8·2 answers
  • Ike Phillips worked 6.7 hours at time-and-a-half pay and 3.4
    10·1 answer
  • Solve for x.
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!