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受欢迎的代数 >

6x^2-13x-8=0

解答

6 x^{2} - 13 x - 8 = 0

解答

x = \frac{8}{3}, x = - \frac{1}{2}

+1

十进制

x = 2.66666 \dots, x = - 0.5

求解步骤

6 x^{2} - 13 x - 8 = 0

使用求根公式求解

x_{1, 2} = \frac{- ( - 13 ) \pm ( - 13 ) ^{2} - 4 \cdot 6 ( - 8 )}{2 \cdot 6}

(- 13)^{2} - 4 \cdot 6 (- 8) = 19

x_{1, 2} = \frac{- ( - 13 ) \pm 19}{2 \cdot 6}

将解分隔开

x_{1} = \frac{- ( - 13 ) + 19}{2 \cdot 6}, x_{2} = \frac{- ( - 13 ) - 19}{2 \cdot 6}

x = \frac{- ( - 13 ) + 19}{2 \cdot 6} : \frac{8}{3}

x = \frac{- ( - 13 ) - 19}{2 \cdot 6} : - \frac{1}{2}

二次方程组的解是:

x = \frac{8}{3}, x = - \frac{1}{2}

作图

流行的例子

5 x^{2} - 80 x = 0

15 y^{2} = 20

8 x^{2} + 30 x - 27 = 0

solvefor x,F=xy^2+z^3+x^2z

so l v e f or x, F = x y^{2} + z^{3} + x^{2} z

1 3^{2} = x^{2} + 1 2^{2}