Find the First Term A_n=21-2n^2

$A_{n} = 21 - 2 n^{2}$

Step 1

Substitute in the value of $n$ to find the $n$ th term.

$A_{1} = 21 - 2 {(1)}^{2}$

Step 2

Simplify each term.

One to any power is one.

$A_{1} = 21 - 2 \cdot 1$

Multiply $- 2$ by $1$ .

$A_{1} = 21 - 2$

Step 3

Subtract $2$ from $21$ .

$A_{1} = 19$