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受欢迎的代数 >

t^2+2t=8

解答

t^{2} + 2 t = 8

解答

t = 2, t = - 4

求解步骤

t^{2} + 2 t = 8

将

8

para o lado esquerdo

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

使用求根公式求解

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

2^{2} - 4 \cdot 1 \cdot (- 8) = 6

t_{1, 2} = \frac{- 2 \pm 6}{2 \cdot 1}

将解分隔开

t_{1} = \frac{- 2 + 6}{2 \cdot 1}, t_{2} = \frac{- 2 - 6}{2 \cdot 1}

t = \frac{- 2 + 6}{2 \cdot 1} : 2

t = \frac{- 2 - 6}{2 \cdot 1} : - 4

二次方程组的解是:

t = 2, t = - 4

作图

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