# How do you evaluate the expression 2n - 7 , for n=8?

Apr 30, 2018

$2 n - 7 = 9$

#### Explanation:

Substitute 8 for n in the first equation, then simplify:

$\left(2 \cdot 8\right) - 7$

$16 - 7 = 9$

$2 n - 7 = 9$

May 1, 2018

$9$

#### Explanation:

$2 n - 7$ simply means a given sequence for certain values of $n$.

Using the equation for example for when $n = 1$:

$2 \left(1\right) - 7$

$\Rightarrow = 2 - 7 = - 5$

Therefore, using $n = 8$:

$2 \left(8\right) - 7$

$\Rightarrow 16 - 7 = 9$