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Differeniation Question watch

1. Can some please tell me how to work out the following question please.

Find the range of values of x for which the gradient of the curve y = x^4 − 2x^2 is negative.
2. Differentiate it and find the set of values of x such that .

Remember that, to differentiate a term of the form , then - multiply by the power and take away one from the power.
4x(x^2-1)<0
4. differentiate the function then investigate which parts of the differentiated function are positive and negative by setting y'=0 to see where in crosses the x axis...
5. Thankyou very much.
6. Okay I differentiated it and got got three different values of x, 1, and the square root of 1 and minus the square root of 1 and also found the y co-ordinates of these points. How exactly would I write this as an answer though knowing where to put the < and > signs. I was never very good at that.

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