math The function D(x) models the cumulative numbe

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?

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

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

    2386x^2+5147x-83602=0

    If you don't know solve that equation in google type:
    quadratic equation online

    When you see list of results click on:
    Free Online Quadratic Equation Solver:Solve by Quadratic Formula

    When page be open in rectangle type:
    2386x^2+5147x-83602=0
    and click option solve it.
    You will see solution step by step.

    4.94 approx = 5

    Approximately the year=1984+5=1989

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