Question

Your teacher recently found an old Nintendo in a thrift store. Use the formula to predict

the value of the Nintendo in 2020? (Remember, x is the years after 1986, and y is the
value, in $.) Do you think this is a realistic prediction of the value of that Nintendo?

FORMULA: f(x) = 3x^2 – 40x + 180

Answer 1

In 2020, it would be about $2,288

I say this is realistic

Explanation:

To find the value you need for x, subtract the starting year from the year you want to find how much it costs:

2020 - 1986 = 34

Substitute the value for x in the equation:

3x^2 - 40x + 180

3 ( 34 )^2 - 40 ( 34 ) ) + 180

3 ( 1156 ) - 1360 + 180

3468 - 1360 + 180

3468 - 1180

2,288