Question

What is 7(n+4) = 21 equal to?

Answer 1

Solve for n?

Divide both sides by 7, then subtract both sides by 4.

Answer 2

7(n+4) = 21
Choices.
n = -1
n = 7
n = 10
n = 1
Im having trouble :/

Answer 3

@geerky42

Answer 4

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.

\[7(n+4)=21\quad\Longrightarrow\quad\dfrac{7(n+4)}7=\dfrac{21}7\]

Answer 5

Then we are left with \(n+4 = 3\).

Answer 6

Ok.

Answer 7

So n = 7? Im not really good with mathematics sorry.

Answer 8

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.

\[n+4=3\quad\Longrightarrow\quad n+4-4=3-4\]
\[\boxed{n=-1}\]

Answer 9

Thank you.