Basic Math Examples

$\frac{1}{n^{2}} + \frac{1}{{(n + 1)}^{2}} + 1$

Step 1

To write $\frac{1}{n^{2}}$ as a fraction with a common denominator, multiply by $\frac{{(n + 1)}^{2}}{{(n + 1)}^{2}}$ .

$\frac{1}{n^{2}} \cdot \frac{{(n + 1)}^{2}}{{(n + 1)}^{2}} + \frac{1}{{(n + 1)}^{2}} + 1$

Step 2

To write $\frac{1}{{(n + 1)}^{2}}$ as a fraction with a common denominator, multiply by $\frac{n^{2}}{n^{2}}$ .

$\frac{1}{n^{2}} \cdot \frac{{(n + 1)}^{2}}{{(n + 1)}^{2}} + \frac{1}{{(n + 1)}^{2}} \cdot \frac{n^{2}}{n^{2}} + 1$

Step 3

Write each expression with a common denominator of $n^{2} {(n + 1)}^{2}$ , by multiplying each by an appropriate factor of $1$ .

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Step 3.1

Multiply $\frac{1}{n^{2}}$ by $\frac{{(n + 1)}^{2}}{{(n + 1)}^{2}}$ .

$\frac{{(n + 1)}^{2}}{n^{2} {(n + 1)}^{2}} + \frac{1}{{(n + 1)}^{2}} \cdot \frac{n^{2}}{n^{2}} + 1$

Step 3.2

Multiply $\frac{1}{{(n + 1)}^{2}}$ by $\frac{n^{2}}{n^{2}}$ .

$\frac{{(n + 1)}^{2}}{n^{2} {(n + 1)}^{2}} + \frac{n^{2}}{{(n + 1)}^{2} n^{2}} + 1$

Step 3.3

Reorder the factors of ${(n + 1)}^{2} n^{2}$ .

$\frac{{(n + 1)}^{2}}{n^{2} {(n + 1)}^{2}} + \frac{n^{2}}{n^{2} {(n + 1)}^{2}} + 1$

Step 4

Combine the numerators over the common denominator.

$\frac{{(n + 1)}^{2} + n^{2}}{n^{2} {(n + 1)}^{2}} + 1$

Step 5

Simplify the numerator.

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Step 5.1

Rewrite ${(n + 1)}^{2}$ as $(n + 1) (n + 1)$ .

$\frac{(n + 1) (n + 1) + n^{2}}{n^{2} {(n + 1)}^{2}} + 1$

Step 5.2

Expand $(n + 1) (n + 1)$ using the FOIL Method.

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Step 5.2.1

Apply the distributive property.

$\frac{n (n + 1) + 1 (n + 1) + n^{2}}{n^{2} {(n + 1)}^{2}} + 1$

Step 5.2.2

Apply the distributive property.

$\frac{n \cdot n + n \cdot 1 + 1 (n + 1) + n^{2}}{n^{2} {(n + 1)}^{2}} + 1$

Step 5.2.3

Apply the distributive property.

$\frac{n \cdot n + n \cdot 1 + 1 n + 1 \cdot 1 + n^{2}}{n^{2} {(n + 1)}^{2}} + 1$

Step 5.3

Simplify and combine like terms.

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Step 5.3.1

Simplify each term.

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Step 5.3.1.1

Multiply $n$ by $n$ .

$\frac{n^{2} + n \cdot 1 + 1 n + 1 \cdot 1 + n^{2}}{n^{2} {(n + 1)}^{2}} + 1$

Step 5.3.1.2

Multiply $n$ by $1$ .

$\frac{n^{2} + n + 1 n + 1 \cdot 1 + n^{2}}{n^{2} {(n + 1)}^{2}} + 1$

Step 5.3.1.3

Multiply $n$ by $1$ .

$\frac{n^{2} + n + n + 1 \cdot 1 + n^{2}}{n^{2} {(n + 1)}^{2}} + 1$

Step 5.3.1.4

Multiply $1$ by $1$ .

$\frac{n^{2} + n + n + 1 + n^{2}}{n^{2} {(n + 1)}^{2}} + 1$

Step 5.3.2

Add $n$ and $n$ .

$\frac{n^{2} + 2 n + 1 + n^{2}}{n^{2} {(n + 1)}^{2}} + 1$

Step 5.4

Add $n^{2}$ and $n^{2}$ .

$\frac{2 n^{2} + 2 n + 1}{n^{2} {(n + 1)}^{2}} + 1$

Step 6

Combine into one fraction.

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Step 6.1

Write $1$ as a fraction with a common denominator.

$\frac{2 n^{2} + 2 n + 1}{n^{2} {(n + 1)}^{2}} + \frac{n^{2} {(n + 1)}^{2}}{n^{2} {(n + 1)}^{2}}$

Step 6.2

Combine the numerators over the common denominator.

$\frac{2 n^{2} + 2 n + 1 + n^{2} {(n + 1)}^{2}}{n^{2} {(n + 1)}^{2}}$

Step 7

Simplify the numerator.

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Step 7.1

Rewrite ${(n + 1)}^{2}$ as $(n + 1) (n + 1)$ .

$\frac{2 n^{2} + 2 n + 1 + n^{2} ((n + 1) (n + 1))}{n^{2} {(n + 1)}^{2}}$

Step 7.2

Expand $(n + 1) (n + 1)$ using the FOIL Method.

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Step 7.2.1

Apply the distributive property.

$\frac{2 n^{2} + 2 n + 1 + n^{2} (n (n + 1) + 1 (n + 1))}{n^{2} {(n + 1)}^{2}}$

Step 7.2.2

Apply the distributive property.

$\frac{2 n^{2} + 2 n + 1 + n^{2} (n \cdot n + n \cdot 1 + 1 (n + 1))}{n^{2} {(n + 1)}^{2}}$

Step 7.2.3

Apply the distributive property.

$\frac{2 n^{2} + 2 n + 1 + n^{2} (n \cdot n + n \cdot 1 + 1 n + 1 \cdot 1)}{n^{2} {(n + 1)}^{2}}$

Step 7.3

Simplify and combine like terms.

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Step 7.3.1

Simplify each term.

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Step 7.3.1.1

Multiply $n$ by $n$ .

$\frac{2 n^{2} + 2 n + 1 + n^{2} (n^{2} + n \cdot 1 + 1 n + 1 \cdot 1)}{n^{2} {(n + 1)}^{2}}$

Step 7.3.1.2

Multiply $n$ by $1$ .

$\frac{2 n^{2} + 2 n + 1 + n^{2} (n^{2} + n + 1 n + 1 \cdot 1)}{n^{2} {(n + 1)}^{2}}$

Step 7.3.1.3

Multiply $n$ by $1$ .

$\frac{2 n^{2} + 2 n + 1 + n^{2} (n^{2} + n + n + 1 \cdot 1)}{n^{2} {(n + 1)}^{2}}$

Step 7.3.1.4

Multiply $1$ by $1$ .

$\frac{2 n^{2} + 2 n + 1 + n^{2} (n^{2} + n + n + 1)}{n^{2} {(n + 1)}^{2}}$

Step 7.3.2

Add $n$ and $n$ .

$\frac{2 n^{2} + 2 n + 1 + n^{2} (n^{2} + 2 n + 1)}{n^{2} {(n + 1)}^{2}}$

Step 7.4

Apply the distributive property.

$\frac{2 n^{2} + 2 n + 1 + n^{2} n^{2} + n^{2} (2 n) + n^{2} \cdot 1}{n^{2} {(n + 1)}^{2}}$

Step 7.5

Simplify.

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Step 7.5.1

Multiply $n^{2}$ by $n^{2}$ by adding the exponents.

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Step 7.5.1.1

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

$\frac{2 n^{2} + 2 n + 1 + n^{2 + 2} + n^{2} (2 n) + n^{2} \cdot 1}{n^{2} {(n + 1)}^{2}}$

Step 7.5.1.2

Add $2$ and $2$ .

$\frac{2 n^{2} + 2 n + 1 + n^{4} + n^{2} (2 n) + n^{2} \cdot 1}{n^{2} {(n + 1)}^{2}}$

Step 7.5.2

Rewrite using the commutative property of multiplication.

$\frac{2 n^{2} + 2 n + 1 + n^{4} + 2 n^{2} n + n^{2} \cdot 1}{n^{2} {(n + 1)}^{2}}$

Step 7.5.3

Multiply $n^{2}$ by $1$ .

$\frac{2 n^{2} + 2 n + 1 + n^{4} + 2 n^{2} n + n^{2}}{n^{2} {(n + 1)}^{2}}$

Step 7.6

Multiply $n^{2}$ by $n$ by adding the exponents.

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Step 7.6.1

Move $n$ .

$\frac{2 n^{2} + 2 n + 1 + n^{4} + 2 (n \cdot n^{2}) + n^{2}}{n^{2} {(n + 1)}^{2}}$

Step 7.6.2

Multiply $n$ by $n^{2}$ .

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Step 7.6.2.1

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

$\frac{2 n^{2} + 2 n + 1 + n^{4} + 2 (n^{1} n^{2}) + n^{2}}{n^{2} {(n + 1)}^{2}}$

Step 7.6.2.2

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

$\frac{2 n^{2} + 2 n + 1 + n^{4} + 2 n^{1 + 2} + n^{2}}{n^{2} {(n + 1)}^{2}}$

Step 7.6.3

Add $1$ and $2$ .

$\frac{2 n^{2} + 2 n + 1 + n^{4} + 2 n^{3} + n^{2}}{n^{2} {(n + 1)}^{2}}$

Step 7.7

Add $2 n^{2}$ and $n^{2}$ .

$\frac{3 n^{2} + 2 n + 1 + n^{4} + 2 n^{3}}{n^{2} {(n + 1)}^{2}}$

Step 7.8

Reorder terms.

$\frac{n^{4} + 2 n^{3} + 3 n^{2} + 2 n + 1}{n^{2} {(n + 1)}^{2}}$