Ответ:
а) х^2-8х+15=0|
д=64-60=4|
х1=(8-2)/2=3|
х2=(8+2)/2=5|ответ: 5 и 3
Б) 3X^2 - 11X - 4 = 0
D = 121 + 48 = 169
√ D = √ 169 = 13
X1 = (11 + 13) : 6 = 4
X2 = (11 - 13) : 6 = - 1/3
в) x^2-9>0
x^2>9
x1=-3
x2=3
x^2-11x+30<0
D=121-120=1
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Ответ:
а) х^2-8х+15=0|
д=64-60=4|
х1=(8-2)/2=3|
х2=(8+2)/2=5|ответ: 5 и 3
Б) 3X^2 - 11X - 4 = 0
D = 121 + 48 = 169
√ D = √ 169 = 13
X1 = (11 + 13) : 6 = 4
X2 = (11 - 13) : 6 = - 1/3
в) x^2-9>0
x^2>9
x1=-3
x2=3
x^2-11x+30<0
D=121-120=1