1.

The domain of the function `f(x)=1/(sqrt(4x-|x^2-10 x+9|))`is `(7-sqrt(40),7+sqrt(40))`(b) `(0,7+sqrt(40))`(c)`(7-sqrt(40),oo)` (d) none of theseA. `(7-sqrt(40), 7+sqrt(40))`B. `(0,7+sqrt(40))`C. `(7-sqrt(40),oo)`D. none of these

Answer» Correct Answer - D
`f(x)=(1)/(sqrt(4x-|x^(2)-10x+9|))`
For `f(x)` to be defined , `|x^(2)-10x+9| lt 4x`
or ` x^(2)-10x +9 lt 4x " and " x^(2)-10x+9 gt -4x`
or ` x^(2)-14x +9 lt 0 " and " x^(2) -6x+9 gt 0`
or ` x in (7-sqrt(40), 7 + sqrt(40)) " and " x in R -{3}`
or ` x in (7-sqrt(40), 3) cup (3,7+sqrt(40))`


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