The polynomial y 077x4 29x3 25 describes the billions of

The polynomial y = -0.77x^4 + 2.9x^3 + 25 describes the billions of flu virus particles in a person\'s body x days after being infected. Find the number of virus particles, in billions, after 4 days. There are billion virus particles in a person\'s body 4 days after being infected.

Solution

Answer :

The polynomial y = - 0.77x⁴ + 2.9x³ +25 gives the billions of flu virus in a person\'s body x days after being infected.

the after 4 days the number of people infected by the flu virus is obtained by putting x = 4

That is y = - 0.77(4)⁴ + 2.9(4)³ + 25 = 13.48 billions

therefore,  the number of people infected by the flu virus after 4 days is 13.48 billions