Find the Difference Quotient f(x)=9x^2+5x

$f (x) = 9 x^{2} + 5 x$

Consider the difference quotient formula.

$\frac{f (x + h) - f (x)}{h}$

Find the components of the definition.

Evaluate the function at $x = x + h$ .

Replace the variable $x$ with $x + h$ in the expression.

$f (x + h) = 9 {(x + h)}^{2} + 5 (x + h)$

Simplify the result.

Simplify each term.

Rewrite ${(x + h)}^{2}$ as $(x + h) (x + h)$ .

$f (x + h) = 9 ((x + h) (x + h)) + 5 (x + h)$

Expand $(x + h) (x + h)$ using the FOIL Method.

Apply the distributive property.

$f (x + h) = 9 (x (x + h) + h (x + h)) + 5 (x + h)$

Apply the distributive property.

$f (x + h) = 9 (x \cdot x + x h + h (x + h)) + 5 (x + h)$

Apply the distributive property.

$f (x + h) = 9 (x \cdot x + x h + h x + h \cdot h) + 5 (x + h)$

Simplify and combine like terms.

Simplify each term.

Multiply $x$ by $x$ .

$f (x + h) = 9 (x^{2} + x h + h x + h \cdot h) + 5 (x + h)$

Multiply $h$ by $h$ .

$f (x + h) = 9 (x^{2} + x h + h x + h^{2}) + 5 (x + h)$

Add $x h$ and $h x$ .

Reorder $x$ and $h$ .

$f (x + h) = 9 (x^{2} + h x + h x + h^{2}) + 5 (x + h)$

Add $h x$ and $h x$ .

$f (x + h) = 9 (x^{2} + 2 h x + h^{2}) + 5 (x + h)$

Apply the distributive property.

$f (x + h) = 9 x^{2} + 9 (2 h x) + 9 h^{2} + 5 (x + h)$

Multiply $2$ by $9$ .

$f (x + h) = 9 x^{2} + 18 (h x) + 9 h^{2} + 5 (x + h)$

Apply the distributive property.

$f (x + h) = 9 x^{2} + 18 h x + 9 h^{2} + 5 x + 5 h$

The final answer is $9 x^{2} + 18 h x + 9 h^{2} + 5 x + 5 h$ .

$9 x^{2} + 18 h x + 9 h^{2} + 5 x + 5 h$

Reorder.

Move $5 x$ .

$9 x^{2} + 18 h x + 9 h^{2} + 5 h + 5 x$

Move $9 x^{2}$ .

$18 h x + 9 h^{2} + 9 x^{2} + 5 h + 5 x$

Reorder $18 h x$ and $9 h^{2}$ .

$9 h^{2} + 18 h x + 9 x^{2} + 5 h + 5 x$

Find the components of the definition.

$f (x + h) = 9 h^{2} + 18 h x + 9 x^{2} + 5 h + 5 x$

$f (x) = 9 x^{2} + 5 x$

$f (x + h) = 9 h^{2} + 18 h x + 9 x^{2} + 5 h + 5 x$

$f (x) = 9 x^{2} + 5 x$

Plug in the components.

$\frac{f (x + h) - f (x)}{h} = \frac{9 h^{2} + 18 h x + 9 x^{2} + 5 h + 5 x - (9 x^{2} + 5 x)}{h}$

Simplify.

Simplify the numerator.

Apply the distributive property.

$\frac{9 h^{2} + 18 h x + 9 x^{2} + 5 h + 5 x - (9 x^{2}) - (5 x)}{h}$

Multiply $9$ by $- 1$ .

$\frac{9 h^{2} + 18 h x + 9 x^{2} + 5 h + 5 x - 9 x^{2} - (5 x)}{h}$

Multiply $5$ by $- 1$ .

$\frac{9 h^{2} + 18 h x + 9 x^{2} + 5 h + 5 x - 9 x^{2} - 5 x}{h}$

Subtract $9 x^{2}$ from $9 x^{2}$ .

$\frac{9 h^{2} + 18 h x + 5 h + 5 x + 0 - 5 x}{h}$

Add $9 h^{2}$ and $0$ .

$\frac{9 h^{2} + 18 h x + 5 h + 5 x - 5 x}{h}$

Subtract $5 x$ from $5 x$ .

$\frac{9 h^{2} + 18 h x + 5 h + 0}{h}$

Add $9 h^{2} + 18 h x + 5 h$ and $0$ .

$\frac{9 h^{2} + 18 h x + 5 h}{h}$

Factor $h$ out of $9 h^{2} + 18 h x + 5 h$ .

Factor $h$ out of $9 h^{2}$ .

$\frac{h (9 h) + 18 h x + 5 h}{h}$

Factor $h$ out of $18 h x$ .

$\frac{h (9 h) + h (18 x) + 5 h}{h}$

Factor $h$ out of $5 h$ .

$\frac{h (9 h) + h (18 x) + h \cdot 5}{h}$

Factor $h$ out of $h (9 h) + h (18 x)$ .

$\frac{h (9 h + 18 x) + h \cdot 5}{h}$

Factor $h$ out of $h (9 h + 18 x) + h \cdot 5$ .

$\frac{h (9 h + 18 x + 5)}{h}$

Reduce the expression by cancelling the common factors.

Cancel the common factor of $h$ .

Cancel the common factor.

$\frac{h (9 h + 18 x + 5)}{h}$

Divide $9 h + 18 x + 5$ by $1$ .

$9 h + 18 x + 5$

Reorder $9 h$ and $18 x$ .

$18 x + 9 h + 5$

Find the Difference Quotient f(x)=9x^2+5x

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