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受欢迎的代数 >

t^2-8t-4=0

解答

t^{2} - 8 t - 4 = 0

解答

t = 2 (2 + 5), t = 2 (2 - 5)

+1

十进制

t = 8.47213 \dots, t = - 0.47213 \dots

求解步骤

t^{2} - 8 t - 4 = 0

使用求根公式求解

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

(- 8)^{2} - 4 \cdot 1 \cdot (- 4) = 45

t_{1, 2} = \frac{- ( - 8 ) \pm 4 5}{2 \cdot 1}

将解分隔开

t_{1} = \frac{- ( - 8 ) + 4 5}{2 \cdot 1}, t_{2} = \frac{- ( - 8 ) - 4 5}{2 \cdot 1}

t = \frac{- ( - 8 ) + 4 5}{2 \cdot 1} : 2 (2 + 5)

t = \frac{- ( - 8 ) - 4 5}{2 \cdot 1} : 2 (2 - 5)

二次方程组的解是:

t = 2 (2 + 5), t = 2 (2 - 5)

作图

流行的例子

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