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Justin simplified $\frac{7}{2 \sqrt{7}}$ by first writing 7 as $\sqrt{49}$ and then dividing numerator and denominator by $\sqrt{7}$.a. Show that Justin's solution is correct.b. Can $\frac{7}{2 \sqrt{5}}$ be simplified by using the same procedure? Explain why or why not.

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Chapter 3

REAL NUMBERS AND RADICALS

Section 7

Rationalizing a Denominator

Whole which of Numbers

Fractions and Mixed Numbers

Decimals

00:18

Determine the smallest num…

00:29

00:52

Divide and, if possible, s…

01:01

Rationalize each numerator…

00:27

Simplify.$$\frac{2}{\s…

01:14

Simplify: $\sqrt{28}-3 \sq…

00:31

Simplify.$$\frac{7}{\s…

01:15

Multiply or divide as indi…

00:14

Simplify by combining like…

00:39

Simplify the expressions.<…

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