Which system of equations can be used to find the roots of the equation 4x^2

You can apply a bhaskara formula or the sum and product method. But I would not advise you to do that. Because all the bi-square equations that are without the coefficients c and b at the same time, the solution will always be X = 0

Look:

Y = 4x^2

4x^2 = 0

x^2 = 0 : 4

x^2 = 0

What the value of x?

Just could be x = 0