The equation of a curve is y = 4x + px + qx where p and q

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The equation of a curve is y = 4x³ + px² + qx where p and q are positive constants.

i) Show that the curve has only one stationary point when p = 23√q. 

ii) In the case where p = 1/2 and q = −6, find
the set of values of x for which y is a
decreasing function of x.

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