what is the value of the expression x-3y when x = 6 and y = 12

Answer: Plz mark me brainlest

Step-by-step explanation:

Just Simply Use Identity:

  a^2 - b^2 = ( a+b) ( a-b)

   Then:

     ( 49X^4 - 36 X^2) = 0

       (7 X^2 + 6 X) ( 7X^2 - 6X) =0

       7X^2 + 6X = 0, then           X( 7X +6) =0    X=0,  7x +6 =0   X = -6/7

           7X^2 -6x =0                   X( 7x - 6) =0   X =0   7x -6 =0    X =6/7

Pull out a factor of x² from f(x) :

16x⁴ - 49x² = x² (16x² - 49)

Now write it as a difference of squares, then factorize:

16x⁴ - 49x² = x² ((4x)² - 7²)

16x⁴ - 49x² = x² (4x - 7) (4x + 7)

Set this equal to 0 and solve for x :

x² (4x - 7) (4x + 7) = 0

x² = 0   or   4x - 7 = 0   or   4x + 7 = 0

x = 0   or   x = 7/4   or   x = -7/4

Answer:

C. 2/5

Hope this helps!!!!!!!!

Answer:

-21x-11

Step-by-step explanation:

-3(5x+2)-(6x-5)

use distributive property

-15x-6 - 6x-5

put like terms together

-15x-6x-6-5

simplify

-21x-11

hope this helps

Answer:

There are 35 students in his class.

Step-by-step explanation:

1. Create a proportion: 60/100=21/x

2. Cross multiply, or not (I prefer to cross multiply). 60x=2100

3. Solve the equation: x=35.

Answer: There are 35 students in his class, 14 people going in school, 21 student online.

Answer:

1. x=π/6+πn, 5π/6+πn

2. x=2π/3+2πn, 4π/3+2πn, π+2πn

3. x=5π/6+πn, 5π/3+πn

4. 2+√3

5. -(√(2-√3))/2

Answer:

32°+20+9x-1

collect like terms

32°+20-1+9x

32+18+9x

50=9x

divide both side by 9

5.6

1 significant figure

=6

Answer:

2

Step-by-step explanation:

1+1 = 2

Answer:

36

Step-by-step explanation:

Answer:

the correct answer is 36

Answer:

6

Step-by-step explanation:

Answer:

Using the variables it gives us it is B=150m

Step-by-step explanation:

1.) $1800-$1350=$450

$1350 is the total balance after 3 months and $450 is the amount he has payed in those 3 months

2.) 450/3=150

You do 450/3 to find how much he is paying per month. If you want to check your work do 1800-1050=750 then do 750/5=150

So you put the numbers in B = Zachary's balance after m months and you get B=150m

Answer:

150m

Step-by-step explanation:

Answer: Vu have $60.

Step-by-step explanation:

Given: Before bet, the ratio of the amount of Deshaun's money to the amount of Vu's money was 4:7.

Let Deshaun's money =4x and Vu's money = 7x

If Vu had $280 before the last competition, then

7x = 280

⇒ x = 40   [Divide both sides by 7]

Deshaun's money = 4x = 4 x 40 = $160

After Vu lost bet, ratio becomes 8:3.

Let Deshaun's money = 8y and Vu's money = 3y

For Deshaun,  8x = 160 ⇒ y = 20  [divide both sides by 8]

Vu's money  = 3 (20)=$60

Hence, Vu have $60.

Answer:

hhhhhh

Step-by-step explanation:

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Answer:

Answer:

A. 2 sinx cosx - 1 + 2 sin^2 x.

Step-by-step explanation:

sin2x = 2 sinx cosx

cos2x = cos^2x - sin^2x

So sin2x - cos2x =  2 sinx cosx - ( cos^2x - sin^2x)

But cos^2 x = 1 - sin^2 x, so we have:

2 sinx cosx - (1 - sin^2 x - sin^2x)

= 2 sinx cosx - 1 + 2 sin^2 x.

Answer:

x=5

Step-by-step explanation:

u should know this not that hard to do

Answer: 0.7

Step-by-step explanation: 3/5 equals 0.6 which is less than 0.7, so 0.7 is the greater of the two.

Answer:

Step-by-step explanation:

1. It is less than three and more than negative five. 1 + 1 is 2 and 2 is less than 3.

Answer:

10

Step-by-step explanation:

5x - 17 = 3x + 3 (vertically opposite angles)

5x - 3x = 3 + 17

2x = 20

x = 20/2

x = 10

hope it helps you!

Answer:

1630 days is that one of your answers?

Hope this helps

Step-by-step explanation:

Answer:

uhm yes 1.747

Step-by-step explanation:

Answer:

1.7469999999

Step-by-step explanation:

Answer:

g(6) = 12

Step-by-step explanation:

g(x) = 1/2x + 9

To find g(6), replace x with 6 in the expression and evaluate it.

g(6) = 1/2 * 6 + 9

g(6) = 3 + 9

g(6) = 12

Answer:

the cost per hour of installation work, $35

Step-by-step explanation:

y = 35x + 100

the slope of a function is the coefficient of x, therefore, it is 35. $100 is the initial fee, since it ia the y intercept, and $35 is the cost per hour. y is the total amount, and x is the number of hours. Therefore, the only possible answer is the third choice,

Answer:

Hello!!! Princess Sakura here ^^

Step-by-step explanation:

First you have to translate it into an understandable equation like this...

[tex]4+7=44[/tex]

You don't have to solve it because it is obvious that 4 and 7 don't add up to 44.

Answer:

Step-by-step explanation:

4+7=44

11=44

11-44 is -33 i guess is what you are looking for?

Answer:

206

Step-by-step explanation:

233 - 27 = 206

Answer:

answer is 0.2341701 your welcome

Answer:

16

Step-by-step explanation:

Write the multiples of each number

4:  4,8,12,16

8: 8,16,24,32

16: 16,21,48

The smallest one that is in all three is 16

Answer:

25s+70l=1110

s+l=21

Answer:

Hello!!! Princess Sakura here ^^

Step-by-step explanation:

The top left one would be choice A.

The one to the right the would be

d=118

g=62

n=96

Then lastly the bottom one would be choice B.

Answer:

x = -7/12 or -0.583.. repeating.

Step-by-step explanation:

6x-5= -6(x+2)

___________ (distributive property)

(to group like terms)

6x-5 = -6x-12

___________ (addition poe) (add 6x on both sides to cancel -6 out)

+6x +6x

___________

12x-5 = -12

__________

+5 +5 (addition poe) (add 5 to both sides to cancel -5 out)

__________

12x = -7

__________

÷12 ÷12 (division poe) (divide both sides by 12 to get x)

x = -7/12

Answer:

[tex]x = 110 \\ (exterio \: angles \: of \: a \: traingle \: sum \: up \: to \: 360)[/tex]

Answer:

x = 110

Step-by-step explanation:

Assuming you require the value of x

The sum of the external angles of a triangle = 360°

The 3 angles shown are external angles.

Subtract the sum of the 2 given angles from 360 for x

x = 360 - (140 + 110) = 360 - 250 = 110