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受欢迎的代数 >

x^2+16x-5=0

解答

x^{2} + 16 x - 5 = 0

解答

x = - 8 + 69, x = - 8 - 69

+1

十进制

x = 0.30662 \dots, x = - 16.30662 \dots

求解步骤

x^{2} + 16 x - 5 = 0

使用求根公式求解

x_{1, 2} = \frac{- 16 \pm 1 6 ^{2} - 4 \cdot 1 \cdot ( - 5 )}{2 \cdot 1}

1 6^{2} - 4 \cdot 1 \cdot (- 5) = 269

x_{1, 2} = \frac{- 16 \pm 2 69}{2 \cdot 1}

将解分隔开

x_{1} = \frac{- 16 + 2 69}{2 \cdot 1}, x_{2} = \frac{- 16 - 2 69}{2 \cdot 1}

x = \frac{- 16 + 2 69}{2 \cdot 1} : - 8 + 69

x = \frac{- 16 - 2 69}{2 \cdot 1} : - 8 - 69

二次方程组的解是:

x = - 8 + 69, x = - 8 - 69

作图

流行的例子

m^{2} + 5 m = 2

solvefor x,9x^2+24xy+16y^2+90x-130y=0

so l v e f or x, 9 x^{2} + 24 x y + 16 y^{2} + 90 x - 130 y = 0

x^{2} + 9 x - 46 = 7 x + 2

0.2 w^{2} - 0.3 w = 20

x^{2} - x + \frac{5}{4} = 0