Mathematics
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OpenStudy (anonymous):
–2(6 – 20n) = 20(2n – 3)
A.
40
B.
–36
C.
no solution
D.
all real numbers
so i got
–2(6 – 20n) = 20(2n – 3)
12-40n=40n-60
n=72
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OpenStudy (igreen):
First step, distribute -2 and 20 into the parentheses.
OpenStudy (igreen):
\(-2(6 - 20n)\)
Distribute -2. Do you know how to do that?
OpenStudy (anonymous):
2*6 =12
OpenStudy (igreen):
That's -2, not 2.
OpenStudy (igreen):
-2 * 6 = ?
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OpenStudy (igreen):
-2 * -20n = ?
OpenStudy (lunymoony):
–2(6 – 20n) = 20(2n – 3)
-12 + 40n = 40n -60 ........when two minus signs meet they turn positive
OpenStudy (anonymous):
2*6 is 12 cuz ur multipling
OpenStudy (lunymoony):
yep!
OpenStudy (anonymous):
ok
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OpenStudy (lunymoony):
so "-12+40n = 40n -20
OpenStudy (lunymoony):
Have any questions just ask
OpenStudy (anonymous):
so it will be 48
OpenStudy (lunymoony):
-12+40n = 40n -20
take 40n from both sides, remember each are positive
-12 = -20
OpenStudy (lunymoony):
-12+40n = 40n -60 ....sry, meant it was a 3, so it is 60
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OpenStudy (lunymoony):
we now have
-12 = -60
OpenStudy (anonymous):
my quieston is what do i do with the 40
OpenStudy (lunymoony):
Add 12 to each side to get a one side solution
-60 (+12)
48
OpenStudy (lunymoony):
the 40n?
OpenStudy (lunymoony):
We took 40n from both sides
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OpenStudy (anonymous):
ok