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The differential equation d2 d+2+Fox+4x=0 represents oscillatory motion together with a frictional coefficient F . Its characteristic equation (in k) is Note: Use the variable / in the characteristic equation and use * to denote multiplication. For example, if your answer is the equation 2/2 - 10 + 8 = 0, you would enter 2*k^2-10*k+8 O . Recall the general quadratic equation ak- + bk + c =0 has discriminant A = b2 - 4ac; this is the quantity that determines the number of solutions as follows: . if A > 0 then there are two real solutions . if A = 0 then there is one real solution . if A