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An increase in supply, such as that caused by a fall in producer costs causes prices to fall, and the quantity consumed to increase.
Diagrammatically, this is represented by an outwards shift of the...

f’(x)= 9x^3+4x

Stationary points occur when f'(x) = 0. To find this, we differentiate f(x) to get f'(x) = 12x^3 - 24x^2. We know that at the stationary points are when f'(x) = 0. so we know that 12x^3 - 24x^2 = 0. We ca...