1.

If `f(x)=sqrt(x^2+a x+4)`is defined for all `x ,`then find the values of `adot`

Answer» Correct Answer - [-4, 4]
`f(x)=sqrt(x^(2)+ax+4)` is defined for all x. Therefore,
`x^(2)+ax+4 ge 0` for all `x`
or `D=a^(2)-16 le 0`
or `a in [-4,4]`


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