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Select the correct answer.

For the next five years, a dairy company wants to increase its daily milk processing capacity (in gallons) according to the equation [tex]y = x^6 - 9x^4 + 70x^2[/tex], where [tex]x[/tex] is the number of years. How many years will it take until the company can process 630 gallons of milk in a day?

A. 2 years
B. 3 years
C. 4 years
D. 5 years

Answer :

To solve how many years it will take for the dairy company to reach a processing capacity of 630 gallons per day, we need to find when the output of the given equation equals 630.

The equation given is:

[tex]\[ y = x^6 - 9x^4 + 70x^2 \][/tex]

We set this equation equal to 630, since we want to find the value of [tex]\( x \)[/tex] (number of years) when the output is 630 gallons:

[tex]\[ x^6 - 9x^4 + 70x^2 = 630 \][/tex]

To solve this, let's rearrange the equation:

[tex]\[ x^6 - 9x^4 + 70x^2 - 630 = 0 \][/tex]

This is a polynomial equation in terms of [tex]\( x \)[/tex]. Our goal is to find the values of [tex]\( x \)[/tex] that satisfy this equation, meaning we solve for [tex]\( x \)[/tex]:

1. Solve for the roots of the polynomial [tex]\( x^6 - 9x^4 + 70x^2 - 630 = 0 \)[/tex].
2. Check the real and non-negative roots to ensure they are suitable for our context, as years cannot be negative, and it must be a non-negative real number.

After solving, we find that:

- The real, non-negative root is [tex]\( x = 3 \)[/tex].

Thus, it will take 3 years for the dairy company to be able to process 630 gallons of milk in a day. Therefore, the correct answer is:

B. 3 years

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