Question

If (Fx) = Square root 4x+9+ 2, which inequality can be used to find the domain of f(x)?

A.Square root 4x is greater than or equal to zero
B.4x +9 is greater than or equal to 0
C. 4x is greater than or equal to 0
D.Square root 4x+9 +2 is greater than or equal to 0

Answer 1

Third one 4x+9

Explanation:

We khow that any any real number inside the root should be positive

• Our root is
  `√(4x+9)`

4x+9 shoul be positive wich can be expressed mathematically by:

4x+9≥0