Graph Using a Table of Values y=2-x^2

$y = 2 - x^{2}$

Step 1

Substitute $- 2$ for $x$ and find the result for $y$ .

$y = 2 - {(- 2)}^{2}$

Step 2

Simplify $2 - {(- 2)}^{2}$ .

Simplify each term.

Raise $- 2$ to the power of $2$ .

$y = 2 - 1 \cdot 4$

Multiply $- 1$ by $4$ .

$y = 2 - 4$

Subtract $4$ from $2$ .

$y = - 2$

Step 3

Substitute $- 1$ for $x$ and find the result for $y$ .

$y = 2 - {(- 1)}^{2}$

Step 4

Simplify $2 - {(- 1)}^{2}$ .

Simplify each term.

Multiply $- 1$ by ${(- 1)}^{2}$ by adding the exponents.

Multiply $- 1$ by ${(- 1)}^{2}$ .

Raise $- 1$ to the power of $1$ .

$y = 2 + {(- 1)}^{1} {(- 1)}^{2}$

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$y = 2 + {(- 1)}^{1 + 2}$

Add $1$ and $2$ .

$y = 2 + {(- 1)}^{3}$

Raise $- 1$ to the power of $3$ .

$y = 2 - 1$

Subtract $1$ from $2$ .

$y = 1$

Step 5

Substitute $0$ for $x$ and find the result for $y$ .

$y = 2 - {(0)}^{2}$

Step 6

Solve the equation for $y$ .

Remove parentheses.

$y = 2 - 0^{2}$

Remove parentheses.

$y = 2 - {(0)}^{2}$

Simplify $2 - {(0)}^{2}$ .

Simplify each term.

Raising $0$ to any positive power yields $0$ .

$y = 2 - 0$

Multiply $- 1$ by $0$ .

$y = 2 + 0$

Add $2$ and $0$ .

$y = 2$

Step 7

Substitute $1$ for $x$ and find the result for $y$ .

$y = 2 - {(1)}^{2}$

Step 8

Solve the equation for $y$ .

Remove parentheses.

$y = 2 - 1^{2}$

Remove parentheses.

$y = 2 - {(1)}^{2}$

Simplify $2 - {(1)}^{2}$ .

Simplify each term.

One to any power is one.

$y = 2 - 1 \cdot 1$

Multiply $- 1$ by $1$ .

$y = 2 - 1$

Subtract $1$ from $2$ .

$y = 1$

Step 9

Substitute $2$ for $x$ and find the result for $y$ .

$y = 2 - {(2)}^{2}$

Step 10

Solve the equation for $y$ .

Remove parentheses.

$y = 2 - 2^{2}$

Remove parentheses.

$y = 2 - {(2)}^{2}$

Simplify $2 - {(2)}^{2}$ .

Simplify each term.

Raise $2$ to the power of $2$ .

$y = 2 - 1 \cdot 4$

Multiply $- 1$ by $4$ .

$y = 2 - 4$

Subtract $4$ from $2$ .

$y = - 2$

Step 11

This is a table of possible values to use when graphing the equation.

$\begin{array}{c} x & y \\ - 2 & - 2 \\ - 1 & 1 \\ 0 & 2 \\ 1 & 1 \\ 2 & - 2 \end{array}$

Step 12

Graph Using a Table of Values y=2-x^2

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