M=
or is it undefined?

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)

1yd 1 ft = 1 1/12 1 1/3 1 1/2 1 1/6

Plz hurry evaluate the expression a+b where a=8 and b=19