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What is the following sum in simplest form?

[tex]\[ \sqrt{8} + 3\sqrt{2} + \sqrt{32} \][/tex]

A. [tex]\( 3\sqrt{8} + 3\sqrt{2} \)[/tex]
B. [tex]\( 5\sqrt{42} \)[/tex]
C. [tex]\( 9\sqrt{2} \)[/tex]
D. [tex]\( 5\sqrt{2} + \sqrt{32} \)[/tex]


Sagot :

To simplify the given expressions and find the sum in its simplest form, let's break down each term step by step.

1. Simplify each term individually:

- [tex]\(\sqrt{8}\)[/tex]:
[tex]\[ \sqrt{8} = \sqrt{4 \times 2} = 2\sqrt{2} \][/tex]
Hence, [tex]\(\sqrt{8} = 2\sqrt{2}\)[/tex].

- [tex]\(3\sqrt{2}\)[/tex]:
This term is already in its simplest form.

- [tex]\(\sqrt{32}\)[/tex]:
[tex]\[ \sqrt{32} = \sqrt{16 \times 2} = 4\sqrt{2} \][/tex]
Hence, [tex]\(\sqrt{32} = 4\sqrt{2}\)[/tex].

- [tex]\(3\sqrt{8}\)[/tex]:
Using the simplified form of [tex]\(\sqrt{8}\)[/tex]:
[tex]\[ 3\sqrt{8} = 3 \times 2\sqrt{2} = 6\sqrt{2} \][/tex]

- [tex]\(3\sqrt{2}\)[/tex]:
This term is already in its simplest form.

- [tex]\(5\sqrt{42}\)[/tex]:
This term is already in its simplest form and cannot be simplified further.

- [tex]\(9\sqrt{2}\)[/tex]:
This term is already in its simplest form.

- [tex]\(5\sqrt{2} + \sqrt{32}\)[/tex]:
Using the simplified form of [tex]\(\sqrt{32}\)[/tex]:
[tex]\[ 5\sqrt{2} + \sqrt{32} = 5\sqrt{2} + 4\sqrt{2} = 9\sqrt{2} \][/tex]

2. Combine the simplified terms step by step:

- First part:
[tex]\[ \sqrt{8} + 3\sqrt{2} + \sqrt{32} = 2\sqrt{2} + 3\sqrt{2} + 4\sqrt{2} \][/tex]
Combine the coefficients:
[tex]\[ 2\sqrt{2} + 3\sqrt{2} + 4\sqrt{2} = (2 + 3 + 4)\sqrt{2} = 9\sqrt{2} \][/tex]

- Second part:
[tex]\[ 3\sqrt{8} + 3\sqrt{2} = 6\sqrt{2} + 3\sqrt{2} \][/tex]
Combine the coefficients:
[tex]\[ 6\sqrt{2} + 3\sqrt{2} = (6 + 3)\sqrt{2} = 9\sqrt{2} \][/tex]

- Third part remains as:
[tex]\[ 5\sqrt{42} \][/tex]

- Fourth part remains as:
[tex]\[ 9\sqrt{2} \][/tex]

- Fifth part:
[tex]\[ 5\sqrt{2} + \sqrt{32} = 5\sqrt{2} + 4\sqrt{2} = 9\sqrt{2} \][/tex]

3. Combine all the parts:

- Simplify the sum of all the combined parts from above:
[tex]\[ 9\sqrt{2} + 9\sqrt{2} + 5\sqrt{42} + 9\sqrt{2} + 9\sqrt{2} \][/tex]

Combine all similar terms:
[tex]\[ (9 + 9 + 9 + 9)\sqrt{2} + 5\sqrt{42} = 36\sqrt{2} + 5\sqrt{42} \][/tex]

Therefore, the sum of the given terms in simplest form is:
[tex]\[ 36\sqrt{2} + 5\sqrt{42} \][/tex]

And using the numerical results obtained from simplifying the exact numerical calculation:
[tex]\[ 12.727922061357855 \][/tex]

Hence, the detailed step-by-step simplification process for the sum is shown above.