Solve for X (This should be easy)

On an airplane there are two seats on the left side and three seats on the right side there are 90 seats o the right side of the plane

Rewrite the following quadratic functions in intercept or factored form. show your work. f(x) = 3x^2 - 12

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).