Morgas
6 год назад
X²+6x-9>0 решить уравнение ?
ОТВЕТЫ
Макарий
Jul 1, 2019
X^2 + 6x - 9 gt; 0
x^2 + 6x - 9 = 0
D = 36 + 4*9 = 72
√D = 6√2
x1 = ( - 6 + 6√2)/2 = - 3 + 3√2;
x2 = ( - 6 - 6√2)/2 = - 3 - 3√2
+ - +
-------------( - 3 - 3√2) -----------------( - 3 + 3√2) ---------------gt; x
x ∈ ( - ∞ ; - 3 - 3 √2) ∪ ( - 3 + 3√2; + ∞)
x^2 + 6x - 9 = 0
D = 36 + 4*9 = 72
√D = 6√2
x1 = ( - 6 + 6√2)/2 = - 3 + 3√2;
x2 = ( - 6 - 6√2)/2 = - 3 - 3√2
+ - +
-------------( - 3 - 3√2) -----------------( - 3 + 3√2) ---------------gt; x
x ∈ ( - ∞ ; - 3 - 3 √2) ∪ ( - 3 + 3√2; + ∞)
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