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If the curve y=a x^(1/2)+b x passes thro...

If the curve `y=a x^(1/2)+b x` passes through the point `(1,2)` and lies above the x-axis for `0lt=xlt=9` and the area enclosed by the curve, the x-axis, and the line `x=4` is `8` sq. units, then `a=1` (b) `b=1` `a=3` (d) `b=-1`

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