X * ( X - 5 ) = 84
X^2 - 5X - 84 = 0
D = 25 - 4*1*(-84) = 25 + 336 = 361
V D = 19
X1 = ( 5 + 19 ) : 2 = 12
X2 = ( - 14 ) : 2 = ( - 7 )
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Второе число = 12 - 5 = 7
= - 7 - ( - 5 ) = - 7 + 5 = ( - 2 )
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Ответ 1) Числа 12 и 7
2) Числа ( - 7) и ( - 2 )