What is this answer?

Question

A​ once-popular children's doll is slowly declining in popularity. The quartic function

f(x)=−0.025x4+0.561x3−3.617x2−1.219x+86.923,

where x is the number of years since​ 1993, can be used to estimate the number of dolls of this type that were sold​ (in thousands) during a given year from 1993 to 2003. Estimate how many dolls were sold in 2001. The number of dolls sold in 2001 was approximately ?

​(Round to the nearest​ thousand.)

Answer 1

t = 8, 2001-1993 = 8

f(x) = .025x^4 + .561x^3 - 3.617x^2 - 1.219x + 86.923

f(8) = .025(8)^4 +.561(8)^3 - 3.617(8^2) - 1.219(8) + 86.923

=102.4 + 287.232 -231.488 - 9.752 + 86.923

= 235.315 x 1000 = 235,315 dolls sold in 2001

up from 86,923 sold in 1983