Precalculus Examples

$f (1) = - 2 x^{2} + x - 4$

Step 1

Replace the variable $x$ with $1$ in the expression.

$f (1) = - 2 {(1)}^{2} + 1 - 4$

Step 2

Simplify the result.

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Step 2.1

Remove parentheses.

$f (1) = - 2 {(1)}^{2} + 1 - 4$

Step 2.2

Simplify each term.

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Step 2.2.1

One to any power is one.

$f (1) = - 2 \cdot 1 + 1 - 4$

Step 2.2.2

Multiply $- 2$ by $1$ .

$f (1) = - 2 + 1 - 4$

Step 2.3

Simplify by adding and subtracting.

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Step 2.3.1

Add $- 2$ and $1$ .

$f (1) = - 1 - 4$

Step 2.3.2

Subtract $4$ from $- 1$ .

$f (1) = - 5$

Step 2.4

The final answer is $- 5$ .

$- 5$

Step 3