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受欢迎的代数 >

3c^3+9=-72

解答

3 c^{3} + 9 = - 72

解答

c = - 3, c = \frac{3}{2} - \frac{3 3}{2} i, c = \frac{3}{2} + \frac{3 3}{2} i

求解步骤

3 c^{3} + 9 = - 72

将

9

到右边

3 c^{3} = - 81

两边除以

3

c^{3} = - 27

对于

x^{3} = f (a)

解为

x = 3 f (a), 3 f (a) \frac{- 1 - 3 i}{2}, 3 f (a) \frac{- 1 + 3 i}{2}

c = 3 - 27, c = 3 - 27 \frac{- 1 + 3 i}{2}, c = 3 - 27 \frac{- 1 - 3 i}{2}

3 - 27 = - 3

化简

3 - 27 \frac{- 1 + 3 i}{2} : \frac{3}{2} - \frac{3 3}{2} i

化简

3 - 27 \frac{- 1 - 3 i}{2} : \frac{3}{2} + \frac{3 3}{2} i

c = - 3, c = \frac{3}{2} - \frac{3 3}{2} i, c = \frac{3}{2} + \frac{3 3}{2} i

作图

流行的例子

y^{3} - 5 y^{2} = 0

z^3+2z^2+21z-58=0

z^{3} + 2 z^{2} + 21 z - 58 = 0

x^3+4x^2-36x-144=0

x^{3} + 4 x^{2} - 36 x - 144 = 0

x^{3} - 9 x^{2} - 4 = 0

2 x^{3} - 5 x^{2} - 3 x = 0