Mathematics
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OpenStudy (anonymous):
How many solutions does the equation have?
4(2x+3)=2(3x-4)
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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
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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
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Vocaloid (vocaloid):
|dw:1443751103915:dw|
OpenStudy (anonymous):
okay so how do i do it
Vocaloid (vocaloid):
|dw:1443751149996:dw|
OpenStudy (anonymous):
ya
Vocaloid (vocaloid):
good, now we have
2(2x + 3) = (3x-4)
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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
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OpenStudy (anonymous):
4x+5=20x
Vocaloid (vocaloid):
nope, not quite...
Vocaloid (vocaloid):
|dw:1443751394748:dw|
Vocaloid (vocaloid):
A = 2
B = 2x
C = 3
A*B + A*C = ?
OpenStudy (anonymous):
ya so 2*2x=4x right
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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 = ?
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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 = ?
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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 = ?
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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 = ?
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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 = ?
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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
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OpenStudy (anonymous):
6+4=10
-4+4=0
Vocaloid (vocaloid):
good, so x = 10
there is only one solution, so our answer is A