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受欢迎的代数 >

x^3-18x-8=0

解答

x^{3} - 18 x - 8 = 0

解答

x = - 4, x = 2 + 6, x = 2 - 6

+1

十进制

x = - 4, x = 4.44948 \dots, x = - 0.44948 \dots

求解步骤

x^{3} - 18 x - 8 = 0

因式分解

x^{3} - 18 x - 8 : (x + 4) (x^{2} - 4 x - 2)

(x + 4) (x^{2} - 4 x - 2) = 0

使用零因数法则： If

ab = 0

then

a = 0

or

b = 0

x + 4 = 0 or x^{2} - 4 x - 2 = 0

解

x + 4 = 0 : x = - 4

解

x^{2} - 4 x - 2 = 0 : x = 2 + 6, x = 2 - 6

解为

x = - 4, x = 2 + 6, x = 2 - 6

作图

流行的例子

384 = 3 (r^{8 - 1})

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

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

3c^3+15c^2-18c=0

3 c^{3} + 15 c^{2} - 18 c = 0

- 4 = x^{4} - 5 x^{2}

2r^3-4r^2-r+2=0

2 r^{3} - 4 r^{2} - r + 2 = 0