Find the values of a for which the expre...

Find the values of a for which the expression `(ax^2+3x-4)/(3x-4x^2+a)` assumes all real values for all real values of x

A

`a in (-(9)/(16),7)`

B

`a in (-(9)/(16),1)`

C

`a in [1,7]`

D

None of these

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The correct Answer is:

C

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