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受欢迎的代数 >

r^2+12r+17=0

解答

r^{2} + 12 r + 17 = 0

解答

r = - 6 + 19, r = - 6 - 19

+1

十进制

r = - 1.64110 \dots, r = - 10.35889 \dots

求解步骤

r^{2} + 12 r + 17 = 0

使用求根公式求解

r_{1, 2} = \frac{- 12 \pm 1 2 ^{2} - 4 \cdot 1 \cdot 17}{2 \cdot 1}

1 2^{2} - 4 \cdot 1 \cdot 17 = 219

r_{1, 2} = \frac{- 12 \pm 2 19}{2 \cdot 1}

将解分隔开

r_{1} = \frac{- 12 + 2 19}{2 \cdot 1}, r_{2} = \frac{- 12 - 2 19}{2 \cdot 1}

r = \frac{- 12 + 2 19}{2 \cdot 1} : - 6 + 19

r = \frac{- 12 - 2 19}{2 \cdot 1} : - 6 - 19

二次方程组的解是:

r = - 6 + 19, r = - 6 - 19

作图

流行的例子

roo t s x^{2} - x + 4

9 x^{2} - 15 x - 6 = 0

solvefor y,y^2+2y+1=0

so l v e f or y, y^{2} + 2 y + 1 = 0

x^{2} - 3 x - 19 = 0

(x-4)^2-10=(x-1)^2-x^2

(x - 4)^{2} - 10 = (x - 1)^{2} - x^{2}