Question 672812
{{{ P }}} is in thousands, so
{{{ 440 = 2x^2 + 20x + 328 }}}
{{{ 2x^2 + 20x - 112 = 0 }}}
{{{x^2 + 10x - 56 = 0 }}}
Complete the square
{{{ x^2 + 10x + (10/2)^2 = 56 + (10/2)^2 }}}
{{{ x^2 + 10x + 25 = 56 + 25 }}}
{{{ ( x + 5 )^2 = 81 }}}
{{{ x + 5 = 9 }}}
{{{ x = 4 }}}
The year is 1984