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
GREYUIT [131]
3 years ago
7

Plese someone answer me b asap

Mathematics
2 answers:
Oduvanchick [21]3 years ago
8 0

Answer:

\huge\boxed{\sf 9y^2 -22y-24}

Step-by-step explanation:

\sf (3y-1)^2 -(2y+4)^2+(2y-3)(2y+3)\\\\Using \ formula:\\\\1) (a-b)^2 = a^2-2ab+b^2\\\\2) (a+b)^2= a^2+2ab+b^2\\\\3) (a+b)(a-b) = a^2-b^2\\\\Applying \ Formulas\\\\(3y)^2-2(3y)(1)+(1)^2-[(2y)^2+2(2y)(4)+(4)^2]+(2y)^2-(3)^2\\\\9y^2-6y+1-[4y^2+16y+16]+4y^2-9\\\\9y^2-6y+1 -4y^2-16y-16+4y^2-9\\\\Combining \ like \ terms\\\\9y^2-4y^2+4y^2-6y-16y+1-16-9\\\\9y^2 -22y-24\\\\\rule[225]{225}{2}

Hope this helped!

<h3>~AH1807</h3>
Ipatiy [6.2K]3 years ago
3 0

Answer:

a) \frac{1}{3} <em>k</em>² - 9

b) -7<em>y</em>² - 3

Step-by-step explanation:

a) (\frac{2}{3} <em>k</em> - 6)² - (\frac{1}{3} <em>k </em>+ 3)²

  = \frac{4}{9} <em>k</em>² - 36 - \frac{1}{9} <em>k</em>² + 9

  = \frac{4}{9} <em>k</em>² - \frac{1}{9} <em>k</em>² + 9 -36

  = \frac{3}{9} <em>k</em>² - 27

  = \frac{1}{3} <em>k</em>² - 9

____________________________________

b) (3<em>y -</em> 1)² - (2<em>y</em> + 4)² + (2<em>y - </em>3) (2<em>y</em> + 3)

  = 9<em>y</em>² - 1 - 4<em>y</em>² + 16 + (2<em>y - </em>3) (2<em>y</em> + 3)

  = 9<em>y</em>² - 4<em>y</em>² - 1 + 16 + (<em>- </em>3) (4<em>y</em>² + 6<em>y</em>)

  = 5<em>y</em>² + 15 - 12<em>y</em>² - 18

  = 5<em>y</em>² - 12<em>y</em>² + 15 - 18

  = -7<em>y</em>² - 3

Hope this helps!

(NOTE: Do you mind marking me as Brainliest?)

You might be interested in
If it takes 6.9 pounds of seed to plant one acre of grass , how many acres can be planted with 8.28 pounds of seeds
Vaselesa [24]
There's 1.2 times as much seed, so you can plant 1.2 times more land.

1.2x1=1.2

So you can only plant 1.2 acres.
6 0
3 years ago
On a coordinate plane, point B(–6, 1) is translated to B prime(–3, –2). Indira uses these steps to find a rule to describe the t
nasty-shy [4]

Answer:

Indira should have written the equations Negative 6 + a = negative 3 and 1 + b = negative 2 in Step 2.

Step-by-step explanation:

Point B(-6, 1) to B'(-3, -2)

Steps to achieve B"

-6+a= -3 ⇒ a= -3+6= 3

1+b= -2 ⇒ b= -2-1= -3

-----------------

Step 1 Substitute the original coordinates and the translated coordinates into (x, y) right-arrow (x + a, y + b): B (negative 6, 1) right-arrow B prime (negative 6 + a, 1 + b) = B prime (negative 3, negative 2)

  • Step 2 Write two equations: Negative 6 + a = negative 2. 1 + b = negative 3.
  • wrong step

Step 3 Solve each equation: Negative 6 + a = negative 2. a = negative 2 + 6. a = 4. 1 + b = 3. b = negative 3 minus 1. b = negative 4.

Step 4 Write the translation rule: (x, y) right-arrow (x + 4, y minus 4)

----------------

  • Indira should have written the equations Negative 6 + a = negative 3 and 1 + b = negative 2 in Step 2.

3 0
3 years ago
Read 2 more answers
Select all that are like terms to 5a5b4
Sunny_sXe [5.5K]
None of them are like terms you have 5a 5b and 4
6 0
4 years ago
Read 2 more answers
Describe several real world situations can be modeled by equations of the form Y equals MX plus be or Y equals MX explain how th
lara [203]

The linear equation represents y = mx + b describes several real world situations such as

  • Relation between printer and ink cartridges,
  • Relationship between number of songs and how much is left on the card.

<u>Step-by-step explanation</u>:

Linear equations  y = mx + b.  

m is your rate of change.

b is your constant. This is the initial value of y. The value of y when x is 0.

Finally, y is the thing that depends on x.

Oh right, examples:  

  •  I buy a printer for $100 and the ink cartridges cost $25 each. The relationship between ink cartridges and total cost.

total cost = 25(cartridges I buy) + 100 or y = 25x + 100

  • I get a $100 iTunes gift card for my birthday and then start buying $1 songs. The relationship between the number of songs I buy and how much is left on the card

amount left on card = -$1(songs bought) + 100 or y = -x +100

5 0
3 years ago
You found a job that pays $15$ per hour. After working for one year, you will get a 4% raise. What will be your new pay rate aft
hammer [34]
Umm I am not sure........
3 0
4 years ago
Other questions:
  • Section J in an arena has 20 rows each row has 15 seats all tickets cost $18 each if I'll seats are sold how much money will the
    11·1 answer
  • Simplify -5g + 10 + 7g - 3
    11·2 answers
  • What is 4/7 of 210? please tell me I need to KNOW!!!!!. Please write your answer in simplest form
    15·2 answers
  • List the factors of 28
    7·2 answers
  • I need a little help on this I have a hole bunch more to have you guys answer for me...
    9·2 answers
  • Twelve times one-half of a number is thirty <br> six. What is the number? a. 3 b. 6 C. 8 d. 18
    13·1 answer
  • Drag the tiles to the boxes to form correct pairs. Not all tiles will be used.
    11·2 answers
  • HELP. Multiply the polynomials and simplify the answer. Show your work.
    8·1 answer
  • If z varies directly as x , and z =30 wnhen x =8,find z when x=4
    13·1 answer
  • 4 1/3 - 1 1/3 in fractions
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!