Calculus Examples

$lim_{x \to a} {(2 x - 1)}^{5}$

Step 1

Evaluate the limit.

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Step 1.1

Move the exponent $5$ from ${(2 x - 1)}^{5}$ outside the limit using the Limits Power Rule.

${(lim_{x \to a} 2 x - 1)}^{5}$

Step 1.2

Split the limit using the Sum of Limits Rule on the limit as $x$ approaches $a$ .

${(lim_{x \to a} 2 x - lim_{x \to a} 1)}^{5}$

Step 1.3

Move the term $2$ outside of the limit because it is constant with respect to $x$ .

${(2 lim_{x \to a} x - lim_{x \to a} 1)}^{5}$

Step 1.4

Evaluate the limit of $1$ which is constant as $x$ approaches $a$ .

${(2 lim_{x \to a} x - 1 \cdot 1)}^{5}$

Step 2

Evaluate the limit of $x$ by plugging in $a$ for $x$ .

${(2 a - 1 \cdot 1)}^{5}$

Step 3

Simplify the answer.

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Step 3.1

Multiply $- 1$ by $1$ .

${(2 a - 1)}^{5}$

Step 3.2

Use the Binomial Theorem.

${(2 a)}^{5} + 5 {(2 a)}^{4} \cdot - 1 + 10 {(2 a)}^{3} {(- 1)}^{2} + 10 {(2 a)}^{2} {(- 1)}^{3} + 5 (2 a) {(- 1)}^{4} + {(- 1)}^{5}$

Step 3.3

Simplify each term.

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Step 3.3.1

Apply the product rule to $2 a$ .

$2^{5} a^{5} + 5 {(2 a)}^{4} \cdot - 1 + 10 {(2 a)}^{3} {(- 1)}^{2} + 10 {(2 a)}^{2} {(- 1)}^{3} + 5 (2 a) {(- 1)}^{4} + {(- 1)}^{5}$

Step 3.3.2

Raise $2$ to the power of $5$ .

$32 a^{5} + 5 {(2 a)}^{4} \cdot - 1 + 10 {(2 a)}^{3} {(- 1)}^{2} + 10 {(2 a)}^{2} {(- 1)}^{3} + 5 (2 a) {(- 1)}^{4} + {(- 1)}^{5}$

Step 3.3.3

Apply the product rule to $2 a$ .

$32 a^{5} + 5 (2^{4} a^{4}) \cdot - 1 + 10 {(2 a)}^{3} {(- 1)}^{2} + 10 {(2 a)}^{2} {(- 1)}^{3} + 5 (2 a) {(- 1)}^{4} + {(- 1)}^{5}$

Step 3.3.4

Raise $2$ to the power of $4$ .

$32 a^{5} + 5 (16 a^{4}) \cdot - 1 + 10 {(2 a)}^{3} {(- 1)}^{2} + 10 {(2 a)}^{2} {(- 1)}^{3} + 5 (2 a) {(- 1)}^{4} + {(- 1)}^{5}$

Step 3.3.5

Multiply $16$ by $5$ .

$32 a^{5} + 80 a^{4} \cdot - 1 + 10 {(2 a)}^{3} {(- 1)}^{2} + 10 {(2 a)}^{2} {(- 1)}^{3} + 5 (2 a) {(- 1)}^{4} + {(- 1)}^{5}$

Step 3.3.6

Multiply $- 1$ by $80$ .

$32 a^{5} - 80 a^{4} + 10 {(2 a)}^{3} {(- 1)}^{2} + 10 {(2 a)}^{2} {(- 1)}^{3} + 5 (2 a) {(- 1)}^{4} + {(- 1)}^{5}$

Step 3.3.7

Apply the product rule to $2 a$ .

$32 a^{5} - 80 a^{4} + 10 (2^{3} a^{3}) {(- 1)}^{2} + 10 {(2 a)}^{2} {(- 1)}^{3} + 5 (2 a) {(- 1)}^{4} + {(- 1)}^{5}$

Step 3.3.8

Raise $2$ to the power of $3$ .

$32 a^{5} - 80 a^{4} + 10 (8 a^{3}) {(- 1)}^{2} + 10 {(2 a)}^{2} {(- 1)}^{3} + 5 (2 a) {(- 1)}^{4} + {(- 1)}^{5}$

Step 3.3.9

Multiply $8$ by $10$ .

$32 a^{5} - 80 a^{4} + 80 a^{3} {(- 1)}^{2} + 10 {(2 a)}^{2} {(- 1)}^{3} + 5 (2 a) {(- 1)}^{4} + {(- 1)}^{5}$

Step 3.3.10

Raise $- 1$ to the power of $2$ .

$32 a^{5} - 80 a^{4} + 80 a^{3} \cdot 1 + 10 {(2 a)}^{2} {(- 1)}^{3} + 5 (2 a) {(- 1)}^{4} + {(- 1)}^{5}$

Step 3.3.11

Multiply $80$ by $1$ .

$32 a^{5} - 80 a^{4} + 80 a^{3} + 10 {(2 a)}^{2} {(- 1)}^{3} + 5 (2 a) {(- 1)}^{4} + {(- 1)}^{5}$

Step 3.3.12

Apply the product rule to $2 a$ .

$32 a^{5} - 80 a^{4} + 80 a^{3} + 10 (2^{2} a^{2}) {(- 1)}^{3} + 5 (2 a) {(- 1)}^{4} + {(- 1)}^{5}$

Step 3.3.13

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

$32 a^{5} - 80 a^{4} + 80 a^{3} + 10 (4 a^{2}) {(- 1)}^{3} + 5 (2 a) {(- 1)}^{4} + {(- 1)}^{5}$

Step 3.3.14

Multiply $4$ by $10$ .

$32 a^{5} - 80 a^{4} + 80 a^{3} + 40 a^{2} {(- 1)}^{3} + 5 (2 a) {(- 1)}^{4} + {(- 1)}^{5}$

Step 3.3.15

Raise $- 1$ to the power of $3$ .

$32 a^{5} - 80 a^{4} + 80 a^{3} + 40 a^{2} \cdot - 1 + 5 (2 a) {(- 1)}^{4} + {(- 1)}^{5}$

Step 3.3.16

Multiply $- 1$ by $40$ .

$32 a^{5} - 80 a^{4} + 80 a^{3} - 40 a^{2} + 5 (2 a) {(- 1)}^{4} + {(- 1)}^{5}$

Step 3.3.17

Multiply $2$ by $5$ .

$32 a^{5} - 80 a^{4} + 80 a^{3} - 40 a^{2} + 10 a {(- 1)}^{4} + {(- 1)}^{5}$

Step 3.3.18

Raise $- 1$ to the power of $4$ .

$32 a^{5} - 80 a^{4} + 80 a^{3} - 40 a^{2} + 10 a \cdot 1 + {(- 1)}^{5}$

Step 3.3.19

Multiply $10$ by $1$ .

$32 a^{5} - 80 a^{4} + 80 a^{3} - 40 a^{2} + 10 a + {(- 1)}^{5}$

Step 3.3.20

Raise $- 1$ to the power of $5$ .

$32 a^{5} - 80 a^{4} + 80 a^{3} - 40 a^{2} + 10 a - 1$