I am having trouble with a couple of questions in terms of the proccess of solving the questions:

3aSolve the equation x^4-2x^2+1=0 for x, where x is real

3b(i)Find the x=axis intercepts

3B(II)Find the minimum value

(iii)Sketch the graph of y=P(X)

I will be greatly apprecieated if any of you would have the time to help and explain these questions for me.