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受欢迎的代数 >

solvefor x,x+2x^2-4=-7x+6

解答

x, x + 2 x^{2} - 4 = - 7 x + 6

解答

x = 1, x = - 5

求解步骤

x + 2 x^{2} - 4 = - 7 x + 6

将

6

para o lado esquerdo

2 x^{2} + x - 10 = - 7 x

将

7 x

para o lado esquerdo

2 x^{2} + 8 x - 10 = 0

使用求根公式求解

x_{1, 2} = \frac{- 8 \pm 8 ^{2} - 4 \cdot 2 ( - 10 )}{2 \cdot 2}

8^{2} - 4 \cdot 2 (- 10) = 12

x_{1, 2} = \frac{- 8 \pm 12}{2 \cdot 2}

将解分隔开

x_{1} = \frac{- 8 + 12}{2 \cdot 2}, x_{2} = \frac{- 8 - 12}{2 \cdot 2}

x = \frac{- 8 + 12}{2 \cdot 2} : 1

x = \frac{- 8 - 12}{2 \cdot 2} : - 5

二次方程组的解是:

x = 1, x = - 5

作图

流行的例子

3 x + 2 x^{2} = 7

x^2-2.454x+1.5=0

x^{2} - 2.454 x + 1.5 = 0

8x^2+13x+4=3x^2

8 x^{2} + 13 x + 4 = 3 x^{2}

3 c^{2} + c - 11 = - 4

x(5x+1.5)-2.6=1.6x(2.5x+0.5)

x (5 x + 1.5) - 2.6 = 1.6 x (2.5 x + 0.5)