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受欢迎的代数 >

2d^2+5d-5=-d

解答

2 d^{2} + 5 d - 5 = - d

解答

d = \frac{- 3 + 19}{2}, d = - \frac{3 + 19}{2}

+1

十进制

d = 0.67944 \dots, d = - 3.67944 \dots

求解步骤

2 d^{2} + 5 d - 5 = - d

将

d

para o lado esquerdo

2 d^{2} + 6 d - 5 = 0

使用求根公式求解

d_{1, 2} = \frac{- 6 \pm 6 ^{2} - 4 \cdot 2 ( - 5 )}{2 \cdot 2}

6^{2} - 4 \cdot 2 (- 5) = 219

d_{1, 2} = \frac{- 6 \pm 2 19}{2 \cdot 2}

将解分隔开

d_{1} = \frac{- 6 + 2 19}{2 \cdot 2}, d_{2} = \frac{- 6 - 2 19}{2 \cdot 2}

d = \frac{- 6 + 2 19}{2 \cdot 2} : \frac{- 3 + 19}{2}

d = \frac{- 6 - 2 19}{2 \cdot 2} : - \frac{3 + 19}{2}

二次方程组的解是:

d = \frac{- 3 + 19}{2}, d = - \frac{3 + 19}{2}

作图

流行的例子

(x+1)(x-2)+x^2=0

(x + 1) (x - 2) + x^{2} = 0

solvefor y,x^3y^2=2x^2+y^2

so l v e f or y, x^{3} y^{2} = 2 x^{2} + y^{2}

completesquare 3x^2-12x+1

co m pl e t es q u a re 3 x^{2} - 12 x + 1

4 y^{2} + 9 - 12 y = 5

solvefor x,x^2-2x+2=0

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