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受欢迎的代数 >

8a^2-14a-15=0

解答

8 a^{2} - 14 a - 15 = 0

解答

a = \frac{5}{2}, a = - \frac{3}{4}

+1

十进制

a = 2.5, a = - 0.75

求解步骤

8 a^{2} - 14 a - 15 = 0

使用求根公式求解

a_{1, 2} = \frac{- ( - 14 ) \pm ( - 14 ) ^{2} - 4 \cdot 8 ( - 15 )}{2 \cdot 8}

(- 14)^{2} - 4 \cdot 8 (- 15) = 26

a_{1, 2} = \frac{- ( - 14 ) \pm 26}{2 \cdot 8}

将解分隔开

a_{1} = \frac{- ( - 14 ) + 26}{2 \cdot 8}, a_{2} = \frac{- ( - 14 ) - 26}{2 \cdot 8}

a = \frac{- ( - 14 ) + 26}{2 \cdot 8} : \frac{5}{2}

a = \frac{- ( - 14 ) - 26}{2 \cdot 8} : - \frac{3}{4}

二次方程组的解是:

a = \frac{5}{2}, a = - \frac{3}{4}

作图

流行的例子

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