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受欢迎的代数 >

x^2+bx-18=0

解答

x^{2} + b x - 18 = 0

解答

x = \frac{- b + b ^{2} + 72}{2}, x = \frac{- b - b ^{2} + 72}{2}

求解步骤

x^{2} + b x - 18 = 0

使用求根公式求解

x_{1, 2} = \frac{- b \pm b ^{2} - 4 \cdot 1 \cdot ( - 18 )}{2 \cdot 1}

化简

b^{2} - 4 \cdot 1 \cdot (- 18) : b^{2} + 72

x_{1, 2} = \frac{- b \pm b ^{2} + 72}{2 \cdot 1}

将解分隔开

x_{1} = \frac{- b + b ^{2} + 72}{2 \cdot 1}, x_{2} = \frac{- b - b ^{2} + 72}{2 \cdot 1}

x = \frac{- b + b ^{2} + 72}{2 \cdot 1} : \frac{- b + b ^{2} + 72}{2}

x = \frac{- b - b ^{2} + 72}{2 \cdot 1} : \frac{- b - b ^{2} + 72}{2}

二次方程组的解是:

x = \frac{- b + b ^{2} + 72}{2}, x = \frac{- b - b ^{2} + 72}{2}

作图

流行的例子

5z^2-8(-3)z-46z+5(-3)^2+30(-3)+62=0

5 z^{2} - 8 (- 3) z - 46 z + 5 (- 3)^{2} + 30 (- 3) + 62 = 0

x^{2} + 5 x = 40

5 x^{2} + 2 x - 16 = 0

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

x^2-x(b-a)=(a+x)(b-x)

x^{2} - x (b - a) = (a + x) (b - x)