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人気のある代数 >

2x^3-5x^2-8x+15=0

解

2 x^{3} - 5 x^{2} - 8 x + 15 = 0

解

x = 3, x = \frac{- 1 + 41}{4}, x = \frac{- 1 - 41}{4}

+1

十進法表記

x = 3, x = 1.35078 \dots, x = - 1.85078 \dots

解答ステップ

2 x^{3} - 5 x^{2} - 8 x + 15 = 0

因数

2 x^{3} - 5 x^{2} - 8 x + 15 : (x - 3) (2 x^{2} + x - 5)

(x - 3) (2 x^{2} + x - 5) = 0

零因子の原則を使用:

ab = 0

ならば

a = 0

または

b = 0

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

解く

x - 3 = 0 : x = 3

解く

2 x^{2} + x - 5 = 0 : x = \frac{- 1 + 41}{4}, x = \frac{- 1 - 41}{4}

解答は

x = 3, x = \frac{- 1 + 41}{4}, x = \frac{- 1 - 41}{4}

グラフ

人気の例

(6x^3)*x^2=6x(3x^2)

(6 x^{3}) \cdot x^{2} = 6 x (3 x^{2})

x^{4} + 2 x^{2} - 8 = 0

x^3-300-43+4= 148/37

x^{3} - 300 - 43 + 4 = \frac{148}{37}

q^{3} = \frac{1}{343}

x^4-3x^3-x^2+9x-6=0

x^{4} - 3 x^{3} - x^{2} + 9 x - 6 = 0