Question

Help help help please​

Answer 1

see explanation

Explanation:

To evaluate f(8), substitute x = 8 into f(x) , that is

f(8) =
`√(2(8)+9)` =
`√(16+9)` =
`√(25)` = ± 5

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Equating

`√(2x+9)` = 3 ( square both sides )

2x + 9 = 9 ( subtract 9 from both sides )

2x = 0 ⇒ x = 0

Thus

f(0) = 3