Calculus Examples

$f (21) = 1900 + 60 x - 0.6 x^{2}$

Step 1

Replace the variable $x$ with $21$ in the expression.

$f (21) = 1900 + 60 (21) - 0.6 {(21)}^{2}$

Step 2

Simplify the result.

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Step 2.1

Simplify each term.

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Step 2.1.1

Multiply $60$ by $21$ .

$f (21) = 1900 + 1260 - 0.6 {(21)}^{2}$

Step 2.1.2

Raise $21$ to the power of $2$ .

$f (21) = 1900 + 1260 - 0.6 \cdot 441$

Step 2.1.3

Multiply $- 0.6$ by $441$ .

$f (21) = 1900 + 1260 - 264.6$

Step 2.2

Simplify by adding and subtracting.

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Step 2.2.1

Add $1900$ and $1260$ .

$f (21) = 3160 - 264.6$

Step 2.2.2

Subtract $264.6$ from $3160$ .

$f (21) = 2895.4$

Step 2.3

The final answer is $2895.4$ .

$2895.4$

Step 3