BIue
  • BIue
What is 7(n+4) = 21 equal to?
Mathematics
chestercat
  • chestercat
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geerky42
  • geerky42
Solve for n? Divide both sides by 7, then subtract both sides by 4.
BIue
  • BIue
7(n+4) = 21 Choices. n = -1 n = 7 n = 10 n = 1 Im having trouble :/
BIue
  • BIue

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geerky42
  • geerky42
You want to isolate n. So first you need to "remove" 7. w can do that by divide it by 7, but we must do that to 21 too. \[7(n+4)=21\quad\Longrightarrow\quad\dfrac{7(n+4)}7=\dfrac{21}7\]
geerky42
  • geerky42
Then we are left with \(n+4 = 3\).
BIue
  • BIue
Ok.
BIue
  • BIue
So n = 7? Im not really good with mathematics sorry.
geerky42
  • geerky42
n is still not isolated, so we need to remove 4. Opposite of adding 4 is subtracting 4. So we subtract \(n+4\) by 4, do the same to 3. \[n+4=3\quad\Longrightarrow\quad n+4-4=3-4\] \[\boxed{n=-1}\]
BIue
  • BIue
Thank you.

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