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受欢迎的代数 >

x^2+12x+16=0

解答

x^{2} + 12 x + 16 = 0

解答

x = 2 (5 - 3), x = - 2 (3 + 5)

+1

十进制

x = - 1.52786 \dots, x = - 10.47213 \dots

求解步骤

x^{2} + 12 x + 16 = 0

使用求根公式求解

x_{1, 2} = \frac{- 12 \pm 1 2 ^{2} - 4 \cdot 1 \cdot 16}{2 \cdot 1}

1 2^{2} - 4 \cdot 1 \cdot 16 = 45

x_{1, 2} = \frac{- 12 \pm 4 5}{2 \cdot 1}

将解分隔开

x_{1} = \frac{- 12 + 4 5}{2 \cdot 1}, x_{2} = \frac{- 12 - 4 5}{2 \cdot 1}

x = \frac{- 12 + 4 5}{2 \cdot 1} : 2 (5 - 3)

x = \frac{- 12 - 4 5}{2 \cdot 1} : - 2 (3 + 5)

二次方程组的解是:

x = 2 (5 - 3), x = - 2 (3 + 5)

作图

流行的例子

y^{2} - 2 = 0

solvefor x,f=x^2y+y^2z

so l v e f or x, f = x^{2} y + y^{2} z

2 x^{2} - 12 x - 18 = 0

r^{2} = 36

x^{2} - 6 x = - 91