X^2 + 9 = 0
X^2 = - 9
ОТВЕТ нет решений ( так как X^2 > 0 )
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X^2 - 2X = 0
X * ( X - 2 ) = 0
X1 = 0
X2 = 2
ОТВЕТ 0 и 2
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2X^2 + 5X + 3 = 0
D = 25 - 24 = 1 ; √ D = 1
X1 = ( - 5 + 1 ) : 4 = - 1
X2 = ( - 5 - 1 ) : 4 = - 1,5
ОТВЕТ ( - 1 ) ; ( - 1,5 )
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X^2 - 14X + 49 = 0
D = 196 - 196 = 0
X = 14 : 2 = 7
ОТВЕТ 7
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4X^2 - 6X - 10 = 0
D = 36 + 160 = 196 ; √ D = 14
X1 = ( 6 + 14 ) : 8 = 2,5
X2 = ( 6 - 14 ) : 8 = - 1
ОТВЕТ 2,5 и ( - 1 )