EXAMPLE 6 Solve a rational equation given a function From 1995 through 2003, the annual sales S (in billions of dollars) of entertainment software can.

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EXAMPLE 6 Solve a rational equation given a function From 1995 through 2003, the annual sales S (in billions of dollars) of entertainment software can be modeled by Video Game Sales S(t) = 848t t < t < 8 where t is the number of years since For which year were the total sales of entertainment software about $5.3 billion? SOLUTION Write given function. S(t) = 848t t t t = Substitute 5.3 for S(t).

EXAMPLE 6 Solve a rational equation given a function 5.3(115t ) = 848t Multiply each side by 115t t = 848t Simplify = 238.5t Subtract 609.5t 2 from each side = 238.5t 2 Subtract 3220 from each side t 2 Divide each side by ±2.95 t Take square roots of each side. Because –2.95 is not in the domain (0 < t < 8), the only solution is 2.95.

EXAMPLE 6 Solve a rational equation given a function So, the total sales of entertainment software were about $5.3 billion about 3 years after 1995, or in ANSWER

GUIDED PRACTICE for Example What If? Use the information in Example 6 to determine in which year the total sales of entertainment software were about $4.5 billion. S(t) = 848t t Write given function. 848t t = Substitute 5.3 for S(t). 4.5(115t ) = 848t Multiply each side by 115t t = 848t Simplify = 330.5t 2 Subtract. SOLUTION

GUIDED PRACTICE for Example = + 2 Divide each side by ±1.95 t Take square roots of each side. Because – 1.95 is not the domain (0 < t < 8 ), the only solution is 1.95 So, the total sales of entertainment software were about $ 4.5 million about two your after 1995, or in 1997