Find three consecutive even integers such that three times the sum of the first and third is 24 greater than 4 times the second.
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OpenStudy (anonymous):
You want to find \(n, (n+1), (n+2)\) such that \(3(n+(n+2)) = 24+ 4(n+1)\). Can you solve this for n?
OpenStudy (anonymous):
no... lol I'm not that good at math
OpenStudy (freckles):
try multiplying a bit
OpenStudy (freckles):
and adding like terms
OpenStudy (freckles):
for example n+(n+2) is the same as n+n+2
which is the same as?
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OpenStudy (anonymous):
2n + 2?
OpenStudy (freckles):
yes not do the multiplying part
there is lots of places where you can use distributive property
that is if you have a(b+c)
then this is equal to a*b+a*c
OpenStudy (freckles):
\[3(2n+2)=24+4(n+1)\]
OpenStudy (freckles):
now*
OpenStudy (anonymous):
now what? lol
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OpenStudy (freckles):
so you have done the distributing part? and you are asking for what step next?
if so please show what you have...
OpenStudy (anonymous):
6n + 6 = 24 + 4n + 4
OpenStudy (freckles):
great
now collect like terms because you have some on the right hand side
OpenStudy (anonymous):
6n + 6 = 28 + 4n
OpenStudy (freckles):
right now get your n terms on one side
and your terms without n on the opposing side
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OpenStudy (freckles):
do this by adding/subtracting terms on both sides
OpenStudy (anonymous):
2n = 22
?
OpenStudy (freckles):
6n-4n=28-6
2n=22
is right
OpenStudy (anonymous):
n = 11 right?
OpenStudy (freckles):
yes
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OpenStudy (freckles):
and oops
I just realized the problem said even
OpenStudy (freckles):
the word even is very important here
OpenStudy (freckles):
\[n,n+2,n+4\]
OpenStudy (anonymous):
Oops, my bad.
OpenStudy (freckles):
\[3(n+[n+4])=24+4(n+2)\]
solve for n all over again
lol
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OpenStudy (freckles):
its fine
those tiny words get looked over sometimes
I should have checked
OpenStudy (anonymous):
would it be
6n + 4 = 24 + 4n + 8?
OpenStudy (freckles):
no
3(2n+4)=6n+12 not 6n+4
OpenStudy (anonymous):
oh ok
OpenStudy (anonymous):
6n + 12 = 24 + 4n + 8
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OpenStudy (freckles):
yes
OpenStudy (anonymous):
6n + 12 = 32 + 4n
OpenStudy (freckles):
great too :)
OpenStudy (freckles):
you are almost there
OpenStudy (anonymous):
2n = 20
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OpenStudy (anonymous):
n = 10?
OpenStudy (freckles):
right
n=10
n+2=10+2=12
n+4=10+4=14
so the three numbers in question are 10,12,14
OpenStudy (anonymous):
Thank you so much!
OpenStudy (anonymous):
I don't think @AlixxKK would benefit from a Mathematica script; it isn't really suitable for this level.