Basic Math Examples

$0 = \frac{10}{\sqrt{c}} - \frac{1}{80}$

Step 1

Rewrite the equation as $\frac{10}{\sqrt{c}} - \frac{1}{80} = 0$ .

$\frac{10}{\sqrt{c}} - \frac{1}{80} = 0$

Step 2

Solve for $\sqrt{c}$ .

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Step 2.1

Add $\frac{1}{80}$ to both sides of the equation.

$\frac{10}{\sqrt{c}} = \frac{1}{80}$

Step 2.2

Find the LCD of the terms in the equation.

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Step 2.2.1

Finding the LCD of a list of values is the same as finding the LCM of the denominators of those values.

$\sqrt{c}, 80$

Step 2.2.2

Since $\sqrt{c}, 80$ contains both numbers and variables, there are two steps to find the LCM. Find LCM for the numeric part $1, 80$ then find LCM for the variable part ${\sqrt{c}}^{1}$ .

Step 2.2.3

The LCM is the smallest positive number that all of the numbers divide into evenly.

1. List the prime factors of each number.

2. Multiply each factor the greatest number of times it occurs in either number.

Step 2.2.4

The number $1$ is not a prime number because it only has one positive factor, which is itself.

Not prime

Step 2.2.5

The prime factors for $80$ are $2 \cdot 2 \cdot 2 \cdot 2 \cdot 5$ .

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Step 2.2.5.1

$80$ has factors of $2$ and $40$ .

$2 \cdot 40$

Step 2.2.5.2

$40$ has factors of $2$ and $20$ .

$2 \cdot 2 \cdot 20$

Step 2.2.5.3

$20$ has factors of $2$ and $10$ .

$2 \cdot 2 \cdot 2 \cdot 10$

Step 2.2.5.4

$10$ has factors of $2$ and $5$ .

$2 \cdot 2 \cdot 2 \cdot 2 \cdot 5$

Step 2.2.6

Multiply $2 \cdot 2 \cdot 2 \cdot 2 \cdot 5$ .

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Step 2.2.6.1

Multiply $2$ by $2$ .

$4 \cdot 2 \cdot 2 \cdot 5$

Step 2.2.6.2

Multiply $4$ by $2$ .

$8 \cdot 2 \cdot 5$

Step 2.2.6.3

Multiply $8$ by $2$ .

$16 \cdot 5$

Step 2.2.6.4

Multiply $16$ by $5$ .

$80$

Step 2.2.7

The factor for ${\sqrt{c}}^{1}$ is $\sqrt{c}$ itself.

${\sqrt{c}}^{1} = \sqrt{c}$

$\sqrt{c}$ occurs $1$ time.

Step 2.2.8

The LCM of ${\sqrt{c}}^{1}$ is the result of multiplying all prime factors the greatest number of times they occur in either term.

$\sqrt{c}$

Step 2.2.9

The LCM for $\sqrt{c}, 80$ is the numeric part $80$ multiplied by the variable part.

$80 \sqrt{c}$

Step 2.3

Multiply each term in $\frac{10}{\sqrt{c}} = \frac{1}{80}$ by $80 \sqrt{c}$ to eliminate the fractions.

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Step 2.3.1

Multiply each term in $\frac{10}{\sqrt{c}} = \frac{1}{80}$ by $80 \sqrt{c}$ .

$\frac{10}{\sqrt{c}} (80 \sqrt{c}) = \frac{1}{80} (80 \sqrt{c})$

Step 2.3.2

Simplify the left side.

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Step 2.3.2.1

Rewrite using the commutative property of multiplication.

$80 \frac{10}{\sqrt{c}} \sqrt{c} = \frac{1}{80} (80 \sqrt{c})$

Step 2.3.2.2

Multiply $80 \frac{10}{\sqrt{c}}$ .

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Step 2.3.2.2.1

Combine $80$ and $\frac{10}{\sqrt{c}}$ .

$\frac{80 \cdot 10}{\sqrt{c}} \sqrt{c} = \frac{1}{80} (80 \sqrt{c})$

Step 2.3.2.2.2

Multiply $80$ by $10$ .

$\frac{800}{\sqrt{c}} \sqrt{c} = \frac{1}{80} (80 \sqrt{c})$

Step 2.3.2.3

Cancel the common factor of $\sqrt{c}$ .

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Step 2.3.2.3.1

Cancel the common factor.

$\frac{800}{\sqrt{c}} \sqrt{c} = \frac{1}{80} (80 \sqrt{c})$

Step 2.3.2.3.2

Rewrite the expression.

$800 = \frac{1}{80} (80 \sqrt{c})$

Step 2.3.3

Simplify the right side.

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Step 2.3.3.1

Cancel the common factor of $80$ .

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Step 2.3.3.1.1

Factor $80$ out of $80 \sqrt{c}$ .

$800 = \frac{1}{80} (80 \sqrt{c})$

Step 2.3.3.1.2

Cancel the common factor.

$800 = \frac{1}{80} (80 \sqrt{c})$

Step 2.3.3.1.3

Rewrite the expression.

$800 = \sqrt{c}$

Step 2.4

Rewrite the equation as $\sqrt{c} = 800$ .

$\sqrt{c} = 800$

Step 3

To remove the radical on the left side of the equation, square both sides of the equation.

${\sqrt{c}}^{2} = 800^{2}$

Step 4

Simplify each side of the equation.

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Step 4.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{c}$ as $c^{\frac{1}{2}}$ .

${(c^{\frac{1}{2}})}^{2} = 800^{2}$

Step 4.2

Simplify the left side.

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Step 4.2.1

Simplify ${(c^{\frac{1}{2}})}^{2}$ .

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Step 4.2.1.1

Multiply the exponents in ${(c^{\frac{1}{2}})}^{2}$ .

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Step 4.2.1.1.1

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$c^{\frac{1}{2} \cdot 2} = 800^{2}$

Step 4.2.1.1.2

Cancel the common factor of $2$ .

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Step 4.2.1.1.2.1

Cancel the common factor.

$c^{\frac{1}{2} \cdot 2} = 800^{2}$

Step 4.2.1.1.2.2

Rewrite the expression.

$c^{1} = 800^{2}$

Step 4.2.1.2

Simplify.

$c = 800^{2}$

Step 4.3

Simplify the right side.

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Step 4.3.1

Raise $800$ to the power of $2$ .

$c = 640000$