Factor the polynomial 3x4 – 2x2 + 15x2 – 10 by grouping.

Which product is the factored form of the polynomial?

(–x2 – 5)(3x2 + 2)
(x2 – 2)(3x2 + 5)
(x2 + 5)(3x2 – 2)
(3x2 – 5)(x2 + 2)