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受欢迎的代数 >

2x^2+9x=8

解答

2 x^{2} + 9 x = 8

解答

x = \frac{- 9 + 145}{4}, x = \frac{- 9 - 145}{4}

+1

十进制

x = 0.76039 \dots, x = - 5.26039 \dots

求解步骤

2 x^{2} + 9 x = 8

将

8

para o lado esquerdo

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

使用求根公式求解

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

9^{2} - 4 \cdot 2 (- 8) = 145

x_{1, 2} = \frac{- 9 \pm 145}{2 \cdot 2}

将解分隔开

x_{1} = \frac{- 9 + 145}{2 \cdot 2}, x_{2} = \frac{- 9 - 145}{2 \cdot 2}

x = \frac{- 9 + 145}{2 \cdot 2} : \frac{- 9 + 145}{4}

x = \frac{- 9 - 145}{2 \cdot 2} : \frac{- 9 - 145}{4}

二次方程组的解是:

x = \frac{- 9 + 145}{4}, x = \frac{- 9 - 145}{4}

作图

流行的例子

solvefor b,a^2=b^2+9.2

so l v e f or b, a^{2} = b^{2} + 9.2

u^{2} - 3 u + 1 = 0

solvefor x,((z-4)^2)/4-(y^2)/3-3x^2=1

so l v e f or x, \frac{( z - 4 ) ^{2}}{4} - \frac{y ^{2}}{3} - 3 x^{2} = 1

completesquare x^2-3x-18

co m pl e t es q u a re x^{2} - 3 x - 18

因式分解 x^2-x=20

f a c t or x^{2} - x = 20