the cost to produce a product is modeled by the function f(x) = 5x2 − 70x + 258 where x is the number of products produced. complete the square to determine the minimum cost of producing this product.

a. 5(x − 7)2 + 13; the minimum cost to produce the product is $13.

b.5(x − 7)2 + 13; the minimum cost to produce the product is $7.

c. 5(x − 7)2 + 258; the minimum cost to produce the product is $7.

d.5(x − 7)2 + 258; the minimum cost to produce the product is $258.