theorem Th16: :: QUIN_1:16

for x, a, b, c being Real st a <> 0 & delta (a,b,c) >= 0 holds
((a * (x ^2)) + (b * x)) + c = (a * (x - (((- b) - (sqrt (delta (a,b,c)))) / (2 * a)))) * (x - (((- b) + (sqrt (delta (a,b,c)))) / (2 * a)))