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受欢迎的代数 >

t^2-9t-10=0

解答

t^{2} - 9 t - 10 = 0

解答

t = 10, t = - 1

求解步骤

t^{2} - 9 t - 10 = 0

使用求根公式求解

t_{1, 2} = \frac{- ( - 9 ) \pm ( - 9 ) ^{2} - 4 \cdot 1 \cdot ( - 10 )}{2 \cdot 1}

(- 9)^{2} - 4 \cdot 1 \cdot (- 10) = 11

t_{1, 2} = \frac{- ( - 9 ) \pm 11}{2 \cdot 1}

将解分隔开

t_{1} = \frac{- ( - 9 ) + 11}{2 \cdot 1}, t_{2} = \frac{- ( - 9 ) - 11}{2 \cdot 1}

t = \frac{- ( - 9 ) + 11}{2 \cdot 1} : 10

t = \frac{- ( - 9 ) - 11}{2 \cdot 1} : - 1

二次方程组的解是:

t = 10, t = - 1

作图

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