# The polynomial y = - 0.79x^4 + 3x^3 +27.3 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 1 day.

Question
Polynomials
The polynomial $$\displaystyle{y}=-{0.79}{x}^{{4}}+{3}{x}^{{3}}+{27.3}$$ 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 1 day.

2021-01-05
Number of virus particles, in billion after 1 day:
For $$\displaystyle{x}={1}$$ day
$$\displaystyle{y}=-{0.79}\times{1}^{{4}}+{3}\times{1}^{{3}}+{27.3}$$
$$\displaystyle{y}=-{0.79}+{3}+{27.3}$$
$$\displaystyle{y}={30.221}$$

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