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Deterine the values of 'x' for which the...

Deterine the values of 'x' for which the function `f(x)=x^(2)+2x-3` is an increasing.
Also, find the co - ordinates of the point on the curve `y=x^(2)+2x-3`, where the normal is parallel to the line `x-4y+7=0`.

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The correct Answer is:
Increasing on `(-1, oo); (2, (1)/(4)) and (-2, -(1)/(4))`
Decreasing on `(-oo, -1); (3, 0).`
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