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受欢迎的代数 >

x^2=-4x-3

解答

x^{2} = - 4 x - 3

解答

x = - 1, x = - 3

求解步骤

x^{2} = - 4 x - 3

将

3

para o lado esquerdo

x^{2} + 3 = - 4 x

将

4 x

para o lado esquerdo

x^{2} + 3 + 4 x = 0

改写成标准形式

a x^{2} + b x + c = 0

x^{2} + 4 x + 3 = 0

使用求根公式求解

x_{1, 2} = \frac{- 4 \pm 4 ^{2} - 4 \cdot 1 \cdot 3}{2 \cdot 1}

4^{2} - 4 \cdot 1 \cdot 3 = 2

x_{1, 2} = \frac{- 4 \pm 2}{2 \cdot 1}

将解分隔开

x_{1} = \frac{- 4 + 2}{2 \cdot 1}, x_{2} = \frac{- 4 - 2}{2 \cdot 1}

x = \frac{- 4 + 2}{2 \cdot 1} : - 1

x = \frac{- 4 - 2}{2 \cdot 1} : - 3

二次方程组的解是:

x = - 1, x = - 3

作图

流行的例子

x^2=2.5^2+10.9^2

x^{2} = 2. 5^{2} + 10. 9^{2}

97 = 215 x - 16 x^{2}

-16x^2+112x+128=0

- 16 x^{2} + 112 x + 128 = 0

n = t^{2} - 12

x^{2} - 2 = 7 x - x^{2}