quadraticformula 3x^2+2x-8=0

解答

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

x = \frac{4}{3}, x = - 2

十进制

x = 1.33333 \dots, x = - 2

求解步骤

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

使用求根公式求解

x_{1, 2} = \frac{- 2 \pm 2 ^{2} - 4 \cdot 3 ( - 8 )}{2 \cdot 3}

2^{2} - 4 \cdot 3 (- 8) = 10

x_{1, 2} = \frac{- 2 \pm 10}{2 \cdot 3}

将解分隔开

x_{1} = \frac{- 2 + 10}{2 \cdot 3}, x_{2} = \frac{- 2 - 10}{2 \cdot 3}

x = \frac{- 2 + 10}{2 \cdot 3} : \frac{4}{3}

x = \frac{- 2 - 10}{2 \cdot 3} : - 2

二次方程组的解是:

x = \frac{4}{3}, x = - 2

4 n^{2} - 3 n - 17 = 5

0.45 (3.15 - x) (2.14 - x) = x

y (n) = 2 \cdot y^{2} (n + 1) - n

2 x = (4 x - 15)^{2}

x^{2} + (x + 5) 2 + 83 = 1200