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受欢迎的代数 >

x^2-2x-2=0,x>0

解答

x^{2} - 2 x - 2 = 0, x > 0

解答

x = 1 + 3

+1

十进制

x = 2.73205 \dots

求解步骤

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

使用求根公式求解

x_{1, 2} = \frac{- ( - 2 ) \pm ( - 2 ) ^{2} - 4 \cdot 1 \cdot ( - 2 )}{2 \cdot 1}

(- 2)^{2} - 4 \cdot 1 \cdot (- 2) = 23

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

将解分隔开

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

x = \frac{- ( - 2 ) + 2 3}{2 \cdot 1} : 1 + 3

x = \frac{- ( - 2 ) - 2 3}{2 \cdot 1} : 1 - 3

二次方程组的解是:

x = 1 + 3, x = 1 - 3

Check constrains

x = 1 + 3

作图

流行的例子

solvefor y,x^2y^9=2

so l v e f or y, x^{2} y^{9} = 2

(-0.02083x^2)+4x-170=0

(- 0.02083 x^{2}) + 4 x - 170 = 0

roo t s x^{2} - x + 2

x^2+3/2 x+9/16 =0

x^{2} + \frac{3}{2} x + \frac{9}{16} = 0

x^{2} + 8 x - 8 = 25