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受欢迎的代数 >

s^2-8s+15=0

解答

s^{2} - 8 s + 15 = 0

解答

s = 5, s = 3

求解步骤

s^{2} - 8 s + 15 = 0

使用求根公式求解

s_{1, 2} = \frac{- ( - 8 ) \pm ( - 8 ) ^{2} - 4 \cdot 1 \cdot 15}{2 \cdot 1}

(- 8)^{2} - 4 \cdot 1 \cdot 15 = 2

s_{1, 2} = \frac{- ( - 8 ) \pm 2}{2 \cdot 1}

将解分隔开

s_{1} = \frac{- ( - 8 ) + 2}{2 \cdot 1}, s_{2} = \frac{- ( - 8 ) - 2}{2 \cdot 1}

s = \frac{- ( - 8 ) + 2}{2 \cdot 1} : 5

s = \frac{- ( - 8 ) - 2}{2 \cdot 1} : 3

二次方程组的解是:

s = 5, s = 3

作图

流行的例子

m^{2} - 15 m + 56 = 0

x=0.5714-2000(0.00249(1-x/(-2))^2)

x = 0.5714 - 2000 (0.00249 (1 - \frac{x}{- 2})^{2})

(6+x)(4+x)=2(24)

(6 + x) (4 + x) = 2 (24)

0 = x^{2} - 15 x + 54

5 x^{2} - 35 + 60 = 0