Thge function D(x) models the cumulative number of deaths from a disease x years after 1984. Estimate the year when ther were 89,000 deaths. D(x) = 2386x^2 +5147x + 5398. there were approximately 89,000 deaths in the year?

Answer 1

D(x)=2386x^2+5147x+5398=89000

2386x^2+5147x+5398-89000=0

2386x^2+5147x-83602=0

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2386x^2+5147x-83602=0
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4.94 approx = 5

Approximately the year=1984+5=1989