Answer:
The first answer which says [tex]9x^{4} \sqrt{5}[/tex]
Step-by-step explanation:
In this question, we just simplify the equation in the following way...
[tex]2x^{2} \sqrt{5x^{4} } +7\sqrt{5x^{8} } = 2x^{2} \sqrt{5} x^{2} + 7\sqrt{5} x^{4} = 2\sqrt{5} x^{4} + 7\sqrt{5} x^{4} = 9\sqrt{5} x^{4} = 9x^{4} \sqrt{5}[/tex]
Therefore the first answer it the right one.
