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受欢迎的代数 >

x^2-4x-160=0

解答

x^{2} - 4 x - 160 = 0

解答

x = 2 (1 + 41), x = 2 (1 - 41)

+1

十进制

x = 14.80624 \dots, x = - 10.80624 \dots

求解步骤

x^{2} - 4 x - 160 = 0

使用求根公式求解

x_{1, 2} = \frac{- ( - 4 ) \pm ( - 4 ) ^{2} - 4 \cdot 1 \cdot ( - 160 )}{2 \cdot 1}

(- 4)^{2} - 4 \cdot 1 \cdot (- 160) = 441

x_{1, 2} = \frac{- ( - 4 ) \pm 4 41}{2 \cdot 1}

将解分隔开

x_{1} = \frac{- ( - 4 ) + 4 41}{2 \cdot 1}, x_{2} = \frac{- ( - 4 ) - 4 41}{2 \cdot 1}

x = \frac{- ( - 4 ) + 4 41}{2 \cdot 1} : 2 (1 + 41)

x = \frac{- ( - 4 ) - 4 41}{2 \cdot 1} : 2 (1 - 41)

二次方程组的解是:

x = 2 (1 + 41), x = 2 (1 - 41)

作图

流行的例子

solvefor x,7x^2+2y^2+2x-7y+16=0

so l v e f or x, 7 x^{2} + 2 y^{2} + 2 x - 7 y + 16 = 0

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266 = 0.68 \cdot 100 \cdot X \cdot 1.79 \cdot (7.2 - 0.4 \cdot X)

0.7x^2-4.2x-0.7=0

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