Question

HELP me please I need it !!

Answer 1

A

Explanation:

Using the substitution u =
`x^{(1)/(2) }`

noting that (
`(1)/(2)` )² =
`(1)/(4)`, then

`x^{(1)/(2) }` + 9
`x^{(1)/(4) }` + 20 = 0

Can be rewritten as

u + 9u² + 20 = 0, that is

9u² + u + 20 = 0 ← in standard form