Pl which of the following could be used as a justification that 3x^2+10-8 is not prime over the set of rational numbers a. (3x+2)(x-4) b.(3x+4)(x-2) c.(3x-2)(x+4) d. (3x-4)(x+2)

Amass weighing 16 pounds stretches a spring 8/3 feet. the mass is initially released from rest from a point 2 feet below the equilibrium position, and the subsequent motion takes place in a medium that offers a damping force that is numerically equal to 1/2 the instantaneous velocity. find the equation of motion if the mass is driven by an external force equal to f(t)=cos(2t).