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18 December, 07:18

The following formula models the number of prison inmates, P, in thousands, who are in U. S prisons x years after 1980.

P=2x^2+22x+318

Find the first year in which the population of U. S. prisons was approximately 1270 thousand people.

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  1. 18 December, 09:59
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    2X^2+22x+318=1270

    2x^2+22x-952=0

    x^2+11x-476=0

    (x+28) (x-17) = 0

    x=17
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