$270 are shared in the ratio 4:5. what is the greater share?

Can some one me with these questions

Factor the polynomial 4x4 – 20x2 – 3x2 + 15 by grouping. what is the resulting expression? (4x2 + 3)(x2 – 5) (4x2 – 3)(x2 – 5) (4x2 – 5)(x2 + 3) (4x2 + 5)(x2 – 3)

If u good at math hit me up on insta or sum @basic_jaiden or @ and