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受欢迎的代数 >

0=-x^2-6x-9

解答

0 = - x^{2} - 6 x - 9

解答

x = - 3

求解步骤

0 = - x^{2} - 6 x - 9

交换两边

- x^{2} - 6 x - 9 = 0

使用求根公式求解

x_{1, 2} = \frac{- ( - 6 ) \pm ( - 6 ) ^{2} - 4 ( - 1 ) ( - 9 )}{2 ( - 1 )}

(- 6)^{2} - 4 (- 1) (- 9) = 0

x_{1, 2} = \frac{- ( - 6 ) \pm 0}{2 ( - 1 )}

x = \frac{- ( - 6 )}{2 ( - 1 )}

\frac{- ( - 6 )}{2 ( - 1 )} = - 3

x = - 3

二次方程组的解是:

x = - 3

作图

流行的例子

N(a)=-2a^2+150a+3,0<= a<= 400

N (a) = - 2 a^{2} + 150 a + 3, 0 \leq a \leq 400

(2 X - 1)^{2} = 8

2 x^{2} + 12 x = - 5

ax^2+2a=x+2a^2x

a x^{2} + 2 a = x + 2 a^{2} x

x=-2x^2-(b-8)x+b/3

x = - 2 x^{2} - (b - 8) x + \frac{b}{3}