I've had a go at this but I can't seem to get anywhere with it.

2x^4 + x^3 - 6x^2 + x + 2 = 0

Use the substitution p = x + 1/x to get a quadratic in p.

I've tried just substituting in x = p - 1/x but the x's don't cancel. How should I approach this problem?

Thanks for your help