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受欢迎的代数 >

n^2-3n-28=0

解答

n^{2} - 3 n - 28 = 0

解答

n = 7, n = - 4

求解步骤

n^{2} - 3 n - 28 = 0

使用求根公式求解

n_{1, 2} = \frac{- ( - 3 ) \pm ( - 3 ) ^{2} - 4 \cdot 1 \cdot ( - 28 )}{2 \cdot 1}

(- 3)^{2} - 4 \cdot 1 \cdot (- 28) = 11

n_{1, 2} = \frac{- ( - 3 ) \pm 11}{2 \cdot 1}

将解分隔开

n_{1} = \frac{- ( - 3 ) + 11}{2 \cdot 1}, n_{2} = \frac{- ( - 3 ) - 11}{2 \cdot 1}

n = \frac{- ( - 3 ) + 11}{2 \cdot 1} : 7

n = \frac{- ( - 3 ) - 11}{2 \cdot 1} : - 4

二次方程组的解是:

n = 7, n = - 4

作图

流行的例子

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f a c t or 16 x^{4} - 49 x^{2} y^{2} + 25 x y

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(- \frac{11}{6}) + m = - \frac{2}{9}

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f a c t or 2 b^{3} - 6 b^{2}

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