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Select the correct answer.

Which expression is equivalent to [tex][tex]$4 x^2 \sqrt{5 x^4} \cdot 3 \sqrt{5 x^6}$[/tex][/tex], if [tex][tex]$x \neq 0$[/tex][/tex]?

A. [tex][tex]$12 x^{10} \sqrt{5}$[/tex][/tex]
B. [tex][tex]$60 x^8$[/tex][/tex]
C. [tex][tex]$35 x^{18}$[/tex][/tex]
D. [tex][tex]$7 x^{10} \sqrt{5}$[/tex][/tex]


Sagot :

To solve this problem, we need to simplify both expressions provided, [tex]\(4 x^2 \sqrt{5 x^4}\)[/tex] and [tex]\(3 \sqrt{5 x^6}\)[/tex], and determine if they are equivalent.

### Simplifying [tex]\(4 x^2 \sqrt{5 x^4}\)[/tex]:

1. Inside the square root:
[tex]\[\sqrt{5 x^4}\][/tex]
This can be split into:
[tex]\[\sqrt{5} \cdot \sqrt{x^4}\][/tex]

2. Simplify [tex]\(\sqrt{x^4}\)[/tex]:
[tex]\[\sqrt{x^4} = x^2\][/tex]

3. Substitute back:
[tex]\[\sqrt{5 x^4} = \sqrt{5} \cdot x^2\][/tex]

4. Multiply with the coefficient [tex]\(4 x^2\)[/tex]:
[tex]\(4 x^2 \cdot (\sqrt{5} \cdot x^2)\)[/tex]:
[tex]\[4 x^2 \cdot x^2 \cdot \sqrt{5} = 4 x^4 \sqrt{5}\][/tex]

### Simplifying [tex]\(3 \sqrt{5 x^6}\)[/tex]:

1. Inside the square root:
[tex]\[\sqrt{5 x^6}\][/tex]
This can be split into:
[tex]\[\sqrt{5} \cdot \sqrt{x^6}\][/tex]

2. Simplify [tex]\(\sqrt{x^6}\)[/tex]:
[tex]\[\sqrt{x^6} = x^3\][/tex]

3. Substitute back:
[tex]\[\sqrt{5 x^6} = \sqrt{5} \cdot x^3\][/tex]

4. Multiply with the coefficient [tex]\(3\)[/tex]:
[tex]\(3 \cdot (\sqrt{5} \cdot x^3)\)[/tex]:
[tex]\[3 x^3 \sqrt{5}\][/tex]

### Compare the two simplified expressions:

- The first expression simplifies to [tex]\(4 x^4 \sqrt{5}\)[/tex]
- The second expression simplifies to [tex]\(3 x^3 \sqrt{5}\)[/tex]

It is clear that the two expressions are not equivalent. Therefore, none of the provided expressions are equivalent to both [tex]\(4 x^2 \sqrt{5 x^4}\)[/tex] and [tex]\(3 \sqrt{5 x^6}\)[/tex] simultaneously.

However, we are asked for the equivalent expression, where only one of the given options likely consider one of the above equivalence results only (if it is matching).

### Considering both provided simplified results with the Options:

- A. [tex]\(12 x^{10} \sqrt{5}\)[/tex]:
[tex]\(\text{Clearly not matching as terms hence not equivalent, so ignore.}\)[/tex]

- B. [tex]\(60 x^8\)[/tex]:
[tex]\(\text{Clearly not matching as terms hence not equivalent, so ignore.}\)[/tex]

- C. [tex]\(35 x^{18}\)[/tex]:
[tex]\(\text{Clearly not matching as terms hence not equivalent, so ignore.}\)[/tex]

- D. [tex]\(7 x^{10} \sqrt{5}\)[/tex]:
[tex]\(\text{Clearly not matching as terms hence not equivalent, so ignore.}\)[/tex]

Since no option matches directly any simplified term:

Thus, none of the options accurately represent the equivalence condition of the given mathematical problem based on simplifications.