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受欢迎的代数 >

6a^2+8a-9=0

解答

6 a^{2} + 8 a - 9 = 0

解答

a = \frac{- 4 + 70}{6}, a = - \frac{4 + 70}{6}

+1

十进制

a = 0.72776 \dots, a = - 2.06110 \dots

求解步骤

6 a^{2} + 8 a - 9 = 0

使用求根公式求解

a_{1, 2} = \frac{- 8 \pm 8 ^{2} - 4 \cdot 6 ( - 9 )}{2 \cdot 6}

8^{2} - 4 \cdot 6 (- 9) = 270

a_{1, 2} = \frac{- 8 \pm 2 70}{2 \cdot 6}

将解分隔开

a_{1} = \frac{- 8 + 2 70}{2 \cdot 6}, a_{2} = \frac{- 8 - 2 70}{2 \cdot 6}

a = \frac{- 8 + 2 70}{2 \cdot 6} : \frac{- 4 + 70}{6}

a = \frac{- 8 - 2 70}{2 \cdot 6} : - \frac{4 + 70}{6}

二次方程组的解是:

a = \frac{- 4 + 70}{6}, a = - \frac{4 + 70}{6}

作图

流行的例子

x^{2} + 5 x - 32 = 0

x^{2} - 9 x + 13 = 2 x + 3

5x^2-21x-5=-7x-2

5 x^{2} - 21 x - 5 = - 7 x - 2

5 x^{2} + 9 x - 6 = 10 x

solvefor x,x^2-49=0

so l v e f or x, x^{2} - 49 = 0