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受欢迎的代数 >

-2r^2+5r-22=-4r^2+6r+6

解答

- 2 r^{2} + 5 r - 22 = - 4 r^{2} + 6 r + 6

解答

r = 4, r = - \frac{7}{2}

+1

十进制

r = 4, r = - 3.5

求解步骤

- 2 r^{2} + 5 r - 22 = - 4 r^{2} + 6 r + 6

将

6

para o lado esquerdo

- 2 r^{2} + 5 r - 28 = - 4 r^{2} + 6 r

将

6 r

para o lado esquerdo

- 2 r^{2} - r - 28 = - 4 r^{2}

将

4 r^{2}

para o lado esquerdo

2 r^{2} - r - 28 = 0

使用求根公式求解

r_{1, 2} = \frac{- ( - 1 ) \pm ( - 1 ) ^{2} - 4 \cdot 2 ( - 28 )}{2 \cdot 2}

(- 1)^{2} - 4 \cdot 2 (- 28) = 15

r_{1, 2} = \frac{- ( - 1 ) \pm 15}{2 \cdot 2}

将解分隔开

r_{1} = \frac{- ( - 1 ) + 15}{2 \cdot 2}, r_{2} = \frac{- ( - 1 ) - 15}{2 \cdot 2}

r = \frac{- ( - 1 ) + 15}{2 \cdot 2} : 4

r = \frac{- ( - 1 ) - 15}{2 \cdot 2} : - \frac{7}{2}

二次方程组的解是:

r = 4, r = - \frac{7}{2}

作图

流行的例子

35 = \frac{n ( n - 3 )}{2}

solvefor x,y=(x-3)^2+1

so l v e f or x, y = (x - 3)^{2} + 1

4 x^{2} + 14 x - 3 = 3 x

- 4 x^{2} + 8 x + 12 = 0

3x^2+16x+1=9x-3

3 x^{2} + 16 x + 1 = 9 x - 3