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受欢迎的代数 >

20x^2-2x-14=0

解答

20 x^{2} - 2 x - 14 = 0

解答

x = \frac{1 + 281}{20}, x = \frac{1 - 281}{20}

+1

十进制

x = 0.88815 \dots, x = - 0.78815 \dots

求解步骤

20 x^{2} - 2 x - 14 = 0

使用求根公式求解

x_{1, 2} = \frac{- ( - 2 ) \pm ( - 2 ) ^{2} - 4 \cdot 20 ( - 14 )}{2 \cdot 20}

(- 2)^{2} - 4 \cdot 20 (- 14) = 2281

x_{1, 2} = \frac{- ( - 2 ) \pm 2 281}{2 \cdot 20}

将解分隔开

x_{1} = \frac{- ( - 2 ) + 2 281}{2 \cdot 20}, x_{2} = \frac{- ( - 2 ) - 2 281}{2 \cdot 20}

x = \frac{- ( - 2 ) + 2 281}{2 \cdot 20} : \frac{1 + 281}{20}

x = \frac{- ( - 2 ) - 2 281}{2 \cdot 20} : \frac{1 - 281}{20}

二次方程组的解是:

x = \frac{1 + 281}{20}, x = \frac{1 - 281}{20}

作图

流行的例子

x^{2} - 10 + 16 = 0

x^{2} - x + 0.21 = 0

3 X^{2} - 1 = 0

solvefor y,f=13-x^3-y^2-z^2-12xy-2z

so l v e f or y, f = 13 - x^{3} - y^{2} - z^{2} - 12 x y - 2 z

solvefor y,y^2-4x-6y+1=0

so l v e f or y, y^{2} - 4 x - 6 y + 1 = 0