Question

Решите через дискриминант а)x^+11x+24=0 б)x^+x-56=0 в)x^-x-2=0 г)x^-4x-5=0 д)x^+8x+12=0

Answer 1

X^2 + 11X + 24 = 0
D = 121 - 96 = 25 ; √ D = 5 
X1 = ( - 11 + 5 ) : 2 = ( - 3 )
X2 = ( - 11 - 5) : 2 = ( - 8 ) 
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X^2 + X - 56 = 0
D = 1 + 224 = 225 ; √ D = 15 
X1 = ( - 1 + 15 ) : 2 = 7 
X2 = ( - 1 - 15 ) : 2 = ( - 8 ) 
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X^2 - X - 2 = 0 
D = 1 + 8 = 9 ; √ D = 3 
X1 = ( 1 + 3 ) : 2 = 2 
X2 = ( 1 - 3 ) : 2 = ( - 1 )
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X^2 - 4X - 5 = 0 
D = 16 + 20 = 36 ; √ D = 6
X1 = ( 4 + 6 ) : 2 = 5 
X2 = ( 4 - 6) : 2 = ( - 1 )
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X^2 + 8X + 12 = 0
D = 64 - 48 = 16 ; √ D = 4 
X1 = ( - 8 + 4 ) : 2 = ( - 2 ) 
X2 = ( - 8 - 4 ) : 2 = ( - 6 )

Answer 2

на, держи. удачи. это вроде тема нетрудная

Answer 3

Спасибо!