Solve 4x^4 + 7x^2 - 2 = 0.
Choose the factored form of the polynomial
expression.
(2x^2 - 1)(2X^2 + 2)
(4x^2 - 1)(x^2 - 2)
(4x^2 + 1)(x^2 - 2)
(4x^2 - 1)(x^2 + 2)