Evaluate the following expressions:

[tex]\[
\begin{array}{l}
\sqrt[4]{81} = 9 \\
-\sqrt{9 \times 9} = \sqrt{a^2} \\
\sqrt[3]{64} = 4 \\
\sqrt[5]{64} = \sqrt[5]{2^6} = 2 \\
\sqrt{125} = 5\sqrt{5}
\end{array}
\][/tex]



Answer :

Certainly! Let's break down each part of the problem step by step and resolve the equations.

1. Resolving the fourth root of 81:

[tex]\[ \sqrt[4]{81} \][/tex]

To find the fourth root of 81, we look for a number which, when raised to the power of 4, equals 81. The correct value is 3, because [tex]\(3^4 = 81\)[/tex].

[tex]\[ \sqrt[4]{81} = 3 \][/tex]

2. Calculating [tex]\(-\sqrt{9 \times 9}\)[/tex]:

[tex]\[ -\sqrt{9 \times 9} \][/tex]

First, calculate [tex]\(9 \times 9\)[/tex]:

[tex]\[ 9 \times 9 = 81 \][/tex]

Then, find the square root of 81:

[tex]\[ \sqrt{81} = 9 \][/tex]

Finally, apply the negative sign:

[tex]\[ -\sqrt{81} = -9 \][/tex]

3. Resolving the cube root of 64:

[tex]\[ \sqrt[3]{64} \][/tex]

To find the cube root of 64, we look for a number which, when raised to the power of 3, equals 64. The correct value is approximately 4.

So,

[tex]\[ \sqrt[3]{64} \approx 4 \][/tex]

4. Resolving the fifth root of 64:

[tex]\[ \sqrt[5]{64} \][/tex]

To find the fifth root of 64, we look for a number which, when raised to the power of 5, equals 64. The result is approximately 2.297.

So,

[tex]\[ \sqrt[5]{64} \approx 2.297 \][/tex]

5. Calculating the square root of 125:

[tex]\[ \sqrt{125} \][/tex]

The square root of 125 is approximately 11.180.

Thus,

[tex]\[ \sqrt{125} \approx 11.180 \][/tex]

Combining all results together, we have:

[tex]\[ \begin{aligned} \sqrt[4]{81} & = 3, \\ -\sqrt{9 \times 9} & = -9, \\ \sqrt[3]{64} & \approx 4, \\ \sqrt[5]{64} & \approx 2.297, \\ \sqrt{125} & \approx 11.180. \end{aligned} \][/tex]

These are the step-by-step solutions to the given mathematical expressions.