easy algebra question below first correct answer gets brainliest

Answer:
[tex]x = \sqrt{5} [/tex]
Step-by-step explanation:
[tex]3 {x}^{2} + 5 {x}^{2} = 35[/tex]
[tex]8 {x}^{2} = 35[/tex]
[tex] {x}^{2} = 5[/tex]
[tex] \sqrt{ {x}^{2} } = \sqrt{5} [/tex]
[tex]x = \sqrt{5} [/tex]