Match the equation 4x^6-2x^3+1=0. With a substitution from the column that could be used to reduced the equation to quadratic form:


a) u=x^-1/3
b) u=x^1/3
c) u=x^-2
d) u=x^2
e) u=x^-2/3
f) u=x^3
g) u=x^2/3
h) u= x^4

Hint:

The powers of x in
4x^6-2x^3+1
are x^6, x^3 and x^0.

What substitution would give a quadratic form, which has powers in x^2,x and x^0.