Only need answer for 2

V1(t) = t4 - 12+3 + 52t2 - 96t + 64 V2(t) = -0.5(t - 3)2(t - 8) V1,2 represents the number of viruses in millions (ex. A value of 2 = 2 million virus) t represents the number of days since the vaccine was given (day 0 represents the day the vaccine was given) 1) At what day(s) after administering the vaccine did the virus count become zero for the V1 vaccine? 2) When will the virus population reach 9 million (use 9) for the V2 vaccine? Solve algebraically