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受欢迎的代数 >

-2x^2+16x-28=0

解答

- 2 x^{2} + 16 x - 28 = 0

解答

x = 4 - 2, x = 4 + 2

+1

十进制

x = 2.58578 \dots, x = 5.41421 \dots

求解步骤

- 2 x^{2} + 16 x - 28 = 0

使用求根公式求解

x_{1, 2} = \frac{- 16 \pm 1 6 ^{2} - 4 ( - 2 ) ( - 28 )}{2 ( - 2 )}

1 6^{2} - 4 (- 2) (- 28) = 42

x_{1, 2} = \frac{- 16 \pm 4 2}{2 ( - 2 )}

将解分隔开

x_{1} = \frac{- 16 + 4 2}{2 ( - 2 )}, x_{2} = \frac{- 16 - 4 2}{2 ( - 2 )}

x = \frac{- 16 + 4 2}{2 ( - 2 )} : 4 - 2

x = \frac{- 16 - 4 2}{2 ( - 2 )} : 4 + 2

二次方程组的解是:

x = 4 - 2, x = 4 + 2

作图

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