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Mathematics 14 Online
OpenStudy (anonymous):

How many solutions does the equation have? 4(2x+3)=2(3x-4)

Vocaloid (vocaloid):

start by dividing both sides by 2

OpenStudy (anonymous):

A. one solution B. infinite solutions C. no solution

OpenStudy (anonymous):

is it B

OpenStudy (anonymous):

i will metal and fan

Vocaloid (vocaloid):

again, start by dividing both sides by 2

Vocaloid (vocaloid):

4(2x+3)/2 = ?

OpenStudy (anonymous):

4.5x

Vocaloid (vocaloid):

nope, not quite hint: 4(A)/2 = 2(A) 4(2x+3)/2 = ?

OpenStudy (anonymous):

2x+3= 5 4*5=20 20/2=10

Vocaloid (vocaloid):

nope, not quite 2x + 3 is not 5. x is attached to the 2, so you can't put them together

Vocaloid (vocaloid):

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OpenStudy (anonymous):

okay so how do i do it

Vocaloid (vocaloid):

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OpenStudy (anonymous):

ya

Vocaloid (vocaloid):

good, now we have 2(2x + 3) = (3x-4)

Vocaloid (vocaloid):

now let's focus on the left side 2(2x+3) = ?

OpenStudy (anonymous):

so it would be 5(2x)

Vocaloid (vocaloid):

nope, remember what I said before. 2x + 3 is not 5, you can't put them together since x is attached to 2

OpenStudy (anonymous):

no the 2 on the other side how do i do it then

Vocaloid (vocaloid):

hint: we'll be using the distributive property A(B+C) = A*B + A*C 2(2x + 3) = _________ follow the pattern

OpenStudy (anonymous):

4x+5=20x

Vocaloid (vocaloid):

nope, not quite...

Vocaloid (vocaloid):

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Vocaloid (vocaloid):

A = 2 B = 2x C = 3 A*B + A*C = ?

OpenStudy (anonymous):

ya so 2*2x=4x right

Vocaloid (vocaloid):

right, that's part of it, keep going A*C = ?

OpenStudy (anonymous):

2*3=6 right

Vocaloid (vocaloid):

good, that gives us 2x + 6 = 3x - 4 now subtract 2x from each side

OpenStudy (anonymous):

6x=-3x

Vocaloid (vocaloid):

nope, not quite... 2x + 6 - 2x = ?

OpenStudy (anonymous):

2x+6=8x

OpenStudy (anonymous):

8x-2x=6x

Vocaloid (vocaloid):

remember what I said earlier

OpenStudy (anonymous):

oh okay

Vocaloid (vocaloid):

hint: 2x - 2x = ?

OpenStudy (anonymous):

0

Vocaloid (vocaloid):

good, so 2x + 6 - 2x = ?

OpenStudy (anonymous):

so it would be 6x

Vocaloid (vocaloid):

nope, not quite

Vocaloid (vocaloid):

2x + 6 - 2x = ?

OpenStudy (anonymous):

2x +6 = 8x 2x-2x=0 8x+0=8x right

Vocaloid (vocaloid):

not quite... we said that 2x - 2x = 0 so 2x + 6 - 2x = ?

Vocaloid (vocaloid):

hint: what's the difference between 2x - 2x and 2x + 6 - 2x ?

OpenStudy (anonymous):

there is a 6

Vocaloid (vocaloid):

good, so 2x + 6 - 2x = ?

OpenStudy (anonymous):

would it be just 6

Vocaloid (vocaloid):

yes! 2x - 2x = 0 2x + 6 - 2x = 6 now let's move to the right side 3x - 2x - 4 = ?

OpenStudy (anonymous):

i know you probaly dont want to help me because i am dum

Vocaloid (vocaloid):

don't say that, I'm happy to help anyone in need

Vocaloid (vocaloid):

3x - 2x = ?

OpenStudy (anonymous):

5x

Vocaloid (vocaloid):

hint: 3 - 2 = 1 3x - 2x = ?

OpenStudy (anonymous):

1 imean

OpenStudy (anonymous):

1x

Vocaloid (vocaloid):

good, 3x - 2x = 1x = x that gives us: 6 = x - 4 now add 4 to each side

OpenStudy (anonymous):

6+4=10 -4+4=0

Vocaloid (vocaloid):

good, so x = 10 there is only one solution, so our answer is A

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