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You can use estimates of square roots to help you estimate and compare numerical expressions involving square roots.

A. Compare the values below. Write [tex]$\ \textless \ $[/tex] or [tex]$\ \textgreater \ $[/tex] to complete each statement.

1. [tex]\( 2 \ \textless \ 6 \)[/tex], so [tex]\( \sqrt{3} + 2 \ \textless \ \sqrt{3} + 6 \)[/tex]

2. [tex]\( -1 \ \textgreater \ -3 \)[/tex], so [tex]\( \sqrt{7} - 1 \ \textgreater \ \sqrt{7} - 3 \)[/tex]

3. [tex]\( 6 \ \textless \ 7 \)[/tex], so [tex]\( 2\sqrt{6} \ \textless \ 2\sqrt{7} \)[/tex]

4. [tex]\( -5 \ \textgreater \ -7 \)[/tex], so [tex]\( -5\sqrt{3} \ \textgreater \ -7\sqrt{3} \)[/tex]


Sagot :

Let's compare each pair of values step-by-step by considering the true hierarchy of the comparisons provided.

1. Compare [tex]\(\sqrt{3} + 2\)[/tex] and [tex]\(\sqrt{3} + 6\)[/tex]:

[tex]\[ \sqrt{3} + 2 \quad \text{vs} \quad \sqrt{3} + 6 \][/tex]

Since [tex]\(\sqrt{3}\)[/tex] is common in both expressions, it is clear that adding 2 to [tex]\(\sqrt{3}\)[/tex] will result in a smaller value than adding 6 to [tex]\(\sqrt{3}\)[/tex]. Therefore,

[tex]\[ \sqrt{3} + 2 < \sqrt{3} + 6 \][/tex]

2. Compare [tex]\(\sqrt{7} - 1\)[/tex] and [tex]\(\sqrt{7} - 3\)[/tex]:

[tex]\[ \sqrt{7} - 1 \quad \text{vs} \quad \sqrt{7} - 3 \][/tex]

Since [tex]\(\sqrt{7}\)[/tex] is common in both expressions, subtracting 1 from [tex]\(\sqrt{7}\)[/tex] will result in a larger value than subtracting 3. Therefore,

[tex]\[ \sqrt{7} - 1 > \sqrt{7} - 3 \][/tex]

3. Compare [tex]\(2 \sqrt{6}\)[/tex] and [tex]\(2 \sqrt{7}\)[/tex]:

[tex]\[ 2 \sqrt{6} \quad \text{vs} \quad 2 \sqrt{7} \][/tex]

Again, since the coefficient 2 is common and [tex]\(\sqrt{7}\)[/tex] is greater than [tex]\(\sqrt{6}\)[/tex], multiplying 2 by [tex]\(\sqrt{7}\)[/tex] will yield a larger result than multiplying 2 by [tex]\(\sqrt{6}\)[/tex]. Therefore,

[tex]\[ 2 \sqrt{6} < 2 \sqrt{7} \][/tex]

4. Compare [tex]\(-5 \sqrt{3}\)[/tex] and [tex]\(-7 \sqrt{3}\)[/tex]:

[tex]\[ -5 \sqrt{3} \quad \text{vs} \quad -7 \sqrt{3} \][/tex]

Since [tex]\(\sqrt{3}\)[/tex] is negative in both expressions, and [tex]\(-5\)[/tex] is greater than [tex]\(-7\)[/tex], the product of [tex]\(-5\)[/tex] with [tex]\(\sqrt{3}\)[/tex] will be more than the product of [tex]\(-7\)[/tex] with [tex]\(\sqrt{3}\)[/tex]. Therefore,

[tex]\[ -5 \sqrt{3} > -7 \sqrt{3} \][/tex]

In summary, to complete each statement with [tex]\(<\)[/tex] or [tex]\(>\)[/tex]:

1. [tex]\(\sqrt{3} + 2 < \sqrt{3} + 6\)[/tex]
2. [tex]\(\sqrt{7} - 1 > \(\sqrt{7} - 3\)[/tex]
3. [tex]\(2 \sqrt{6} < 2 \sqrt{7}\)[/tex]
4. [tex]\(-5 \sqrt{3} > -7 \sqrt{3}\)[/tex]