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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
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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.

User Luckystars
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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
User Joserobleda
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