Pre-Algebra Examples

 $\begin{array}{r} h = & 456 \\ l = & x \\ w = & 9110 \end{array}$

Step 1

The surface area of a pyramid is equal to the sum of the areas of each side of the pyramid. The base of the pyramid has area $l w$ , and $s_{l}$ and $s_{w}$ represent the slant height on the length and slant height on the width.

$(l e n g t h) \cdot (w i d t h) + (w i d t h) \cdot s_{l} + (l e n g t h) \cdot s_{w}$

Step 2

Substitute the values of the length $l = x$ , the width $w = 9110$ , and the height $h = 456$ into the formula for surface area of a pyramid.

$x \cdot 9110 + 9110 \cdot \sqrt{{(\frac{x}{2})}^{2} + {(456)}^{2}} + x \cdot \sqrt{{(\frac{9110}{2})}^{2} + {(456)}^{2}}$

Step 3

Simplify each term.

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Step 3.1

Move $9110$ to the left of $x$ .

$9110 \cdot x + 9110 \cdot \sqrt{{(\frac{x}{2})}^{2} + {(456)}^{2}} + x \cdot \sqrt{{(\frac{9110}{2})}^{2} + {(456)}^{2}}$

Step 3.2

Apply the product rule to $\frac{x}{2}$ .

$9110 x + 9110 \cdot \sqrt{\frac{x^{2}}{2^{2}} + {(456)}^{2}} + x \cdot \sqrt{{(\frac{9110}{2})}^{2} + {(456)}^{2}}$

Step 3.3

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

$9110 x + 9110 \cdot \sqrt{\frac{x^{2}}{4} + {(456)}^{2}} + x \cdot \sqrt{{(\frac{9110}{2})}^{2} + {(456)}^{2}}$

Step 3.4

Raise $456$ to the power of $2$ .

$9110 x + 9110 \cdot \sqrt{\frac{x^{2}}{4} + 207936} + x \cdot \sqrt{{(\frac{9110}{2})}^{2} + {(456)}^{2}}$

Step 3.5

To write $207936$ as a fraction with a common denominator, multiply by $\frac{4}{4}$ .

$9110 x + 9110 \cdot \sqrt{\frac{x^{2}}{4} + 207936 \cdot \frac{4}{4}} + x \cdot \sqrt{{(\frac{9110}{2})}^{2} + {(456)}^{2}}$

Step 3.6

Combine $207936$ and $\frac{4}{4}$ .

$9110 x + 9110 \cdot \sqrt{\frac{x^{2}}{4} + \frac{207936 \cdot 4}{4}} + x \cdot \sqrt{{(\frac{9110}{2})}^{2} + {(456)}^{2}}$

Step 3.7

Combine the numerators over the common denominator.

$9110 x + 9110 \cdot \sqrt{\frac{x^{2} + 207936 \cdot 4}{4}} + x \cdot \sqrt{{(\frac{9110}{2})}^{2} + {(456)}^{2}}$

Step 3.8

Multiply $207936$ by $4$ .

$9110 x + 9110 \cdot \sqrt{\frac{x^{2} + 831744}{4}} + x \cdot \sqrt{{(\frac{9110}{2})}^{2} + {(456)}^{2}}$

Step 3.9

Rewrite $\frac{x^{2} + 831744}{4}$ as ${(\frac{1}{2})}^{2} (x^{2} + 831744)$ .

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Step 3.9.1

Factor the perfect power $1^{2}$ out of $x^{2} + 831744$ .

$9110 x + 9110 \cdot \sqrt{\frac{1^{2} (x^{2} + 831744)}{4}} + x \cdot \sqrt{{(\frac{9110}{2})}^{2} + {(456)}^{2}}$

Step 3.9.2

Factor the perfect power $2^{2}$ out of $4$ .

$9110 x + 9110 \cdot \sqrt{\frac{1^{2} (x^{2} + 831744)}{2^{2} \cdot 1}} + x \cdot \sqrt{{(\frac{9110}{2})}^{2} + {(456)}^{2}}$

Step 3.9.3

Rearrange the fraction $\frac{1^{2} (x^{2} + 831744)}{2^{2} \cdot 1}$ .

$9110 x + 9110 \cdot \sqrt{{(\frac{1}{2})}^{2} (x^{2} + 831744)} + x \cdot \sqrt{{(\frac{9110}{2})}^{2} + {(456)}^{2}}$

Step 3.10

Pull terms out from under the radical.

$9110 x + 9110 \cdot (\frac{1}{2} \sqrt{x^{2} + 831744}) + x \cdot \sqrt{{(\frac{9110}{2})}^{2} + {(456)}^{2}}$

Step 3.11

Combine $\frac{1}{2}$ and $\sqrt{x^{2} + 831744}$ .

$9110 x + 9110 \cdot \frac{\sqrt{x^{2} + 831744}}{2} + x \cdot \sqrt{{(\frac{9110}{2})}^{2} + {(456)}^{2}}$

Step 3.12

Cancel the common factor of $2$ .

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Step 3.12.1

Factor $2$ out of $9110$ .

$9110 x + 2 (4555) \cdot \frac{\sqrt{x^{2} + 831744}}{2} + x \cdot \sqrt{{(\frac{9110}{2})}^{2} + {(456)}^{2}}$

Step 3.12.2

Cancel the common factor.

$9110 x + 2 \cdot 4555 \cdot \frac{\sqrt{x^{2} + 831744}}{2} + x \cdot \sqrt{{(\frac{9110}{2})}^{2} + {(456)}^{2}}$

Step 3.12.3

Rewrite the expression.

$9110 x + 4555 \cdot \sqrt{x^{2} + 831744} + x \cdot \sqrt{{(\frac{9110}{2})}^{2} + {(456)}^{2}}$

Step 3.13

Divide $9110$ by $2$ .

$9110 x + 4555 \sqrt{x^{2} + 831744} + x \cdot \sqrt{4555^{2} + {(456)}^{2}}$

Step 3.14

Raise $4555$ to the power of $2$ .

$9110 x + 4555 \sqrt{x^{2} + 831744} + x \cdot \sqrt{20748025 + {(456)}^{2}}$

Step 3.15

Raise $456$ to the power of $2$ .

$9110 x + 4555 \sqrt{x^{2} + 831744} + x \cdot \sqrt{20748025 + 207936}$

Step 3.16

Add $20748025$ and $207936$ .

$9110 x + 4555 \sqrt{x^{2} + 831744} + x \sqrt{20955961}$