Which choice is equivalent to the expression below when [tex]$x \geq 0$[/tex]?

[tex]\sqrt{50 x^3} - \sqrt{25 x^3} + 5 \sqrt{x^3} - \sqrt{2 x^3}[/tex]

A. [tex]4 \sqrt{x}[/tex]

B. [tex]28 \sqrt{x^3}[/tex]

C. [tex]5 \sqrt{2 x}[/tex]

D. [tex]4 x \sqrt{2 x}[/tex]



Answer :

To simplify the expression [tex]\(\sqrt{50 x^3}-\sqrt{25 x^3}+5 \sqrt{x^3}-\sqrt{2 x^3}\)[/tex], let us handle each term separately and then combine them.

1. Simplify [tex]\(\sqrt{50 x^3}\)[/tex]:
[tex]\[ \sqrt{50 x^3} = \sqrt{50} \cdot \sqrt{x^3} \][/tex]
Knowing that [tex]\(\sqrt{x^3} = x^{3/2}\)[/tex], we have:
[tex]\[ \sqrt{50} \cdot x^{3/2} = \sqrt{25 \cdot 2} \cdot x^{3/2} = 5\sqrt{2} \cdot x^{3/2} \][/tex]

2. Simplify [tex]\(\sqrt{25 x^3}\)[/tex]:
[tex]\[ \sqrt{25 x^3} = \sqrt{25} \cdot \sqrt{x^3} \][/tex]
[tex]\[ \sqrt{25} \cdot x^{3/2} = 5 \cdot x^{3/2} \][/tex]

3. Simplify [tex]\(5 \sqrt{x^3}\)[/tex]:
[tex]\[ 5 \sqrt{x^3} = 5 \cdot x^{3/2} \][/tex]

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

Now, let's combine the simplified terms:
[tex]\[ 5\sqrt{2} \cdot x^{3/2} - 5 \cdot x^{3/2} + 5 \cdot x^{3/2} - \sqrt{2} \cdot x^{3/2} \][/tex]

Group like terms (terms with [tex]\( x^{3/2} \)[/tex]):
[tex]\[ (5\sqrt{2} - 5 + 5 - \sqrt{2}) x^{3/2} \][/tex]

Simplify the coefficients:
[tex]\[ (5\sqrt{2} - \sqrt{2}) x^{3/2} \][/tex]
[tex]\[ (4\sqrt{2}) x^{3/2} \][/tex]
[tex]\[ 4 \sqrt{2} \cdot x^{3/2} \][/tex]

Rewrite [tex]\( x^{3/2} \)[/tex] as [tex]\( x \cdot \sqrt{x} \)[/tex]:
[tex]\[ 4 \sqrt{2} \cdot x \cdot \sqrt{x} \][/tex]
[tex]\[ 4x \sqrt{2x} \][/tex]

Therefore, the expression simplifies to [tex]\( 4x \sqrt{2x} \)[/tex], corresponding to choice D.

So the answer is:
[tex]\[ \boxed{4 x \sqrt{2 x}} \][/tex]