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受欢迎的代数 >

9x^2-8x=19

解答

9 x^{2} - 8 x = 19

解答

x = \frac{4 + 187}{9}, x = \frac{4 - 187}{9}

+1

十进制

x = 1.96386 \dots, x = - 1.07497 \dots

求解步骤

9 x^{2} - 8 x = 19

将

19

para o lado esquerdo

9 x^{2} - 8 x - 19 = 0

使用求根公式求解

x_{1, 2} = \frac{- ( - 8 ) \pm ( - 8 ) ^{2} - 4 \cdot 9 ( - 19 )}{2 \cdot 9}

(- 8)^{2} - 4 \cdot 9 (- 19) = 2187

x_{1, 2} = \frac{- ( - 8 ) \pm 2 187}{2 \cdot 9}

将解分隔开

x_{1} = \frac{- ( - 8 ) + 2 187}{2 \cdot 9}, x_{2} = \frac{- ( - 8 ) - 2 187}{2 \cdot 9}

x = \frac{- ( - 8 ) + 2 187}{2 \cdot 9} : \frac{4 + 187}{9}

x = \frac{- ( - 8 ) - 2 187}{2 \cdot 9} : \frac{4 - 187}{9}

二次方程组的解是:

x = \frac{4 + 187}{9}, x = \frac{4 - 187}{9}

作图

流行的例子

0 = 3 x^{2} - 16 x + 24

4.9 x^{2} - 6 x - 20 = 0

solvefor y,χy^2z^3=2

so l v e f or y, χ y^{2} z^{3} = 2

0 = - 3 x^{2} + 4

solvefor y,x+y^2=2

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