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受欢迎的代数 >

12x^2+8x=7

解答

12 x^{2} + 8 x = 7

解答

x = \frac{1}{2}, x = - \frac{7}{6}

+1

十进制

x = 0.5, x = - 1.16666 \dots

求解步骤

12 x^{2} + 8 x = 7

将

7

para o lado esquerdo

12 x^{2} + 8 x - 7 = 0

使用求根公式求解

x_{1, 2} = \frac{- 8 \pm 8 ^{2} - 4 \cdot 12 ( - 7 )}{2 \cdot 12}

8^{2} - 4 \cdot 12 (- 7) = 20

x_{1, 2} = \frac{- 8 \pm 20}{2 \cdot 12}

将解分隔开

x_{1} = \frac{- 8 + 20}{2 \cdot 12}, x_{2} = \frac{- 8 - 20}{2 \cdot 12}

x = \frac{- 8 + 20}{2 \cdot 12} : \frac{1}{2}

x = \frac{- 8 - 20}{2 \cdot 12} : - \frac{7}{6}

二次方程组的解是:

x = \frac{1}{2}, x = - \frac{7}{6}

作图

流行的例子

(x+a)(x-a)+4a(a-x)=0

(x + a) (x - a) + 4 a (a - x) = 0

solvefor x,(x+5)^2=2y

so l v e f or x, (x + 5)^{2} = 2 y

quadraticformula 8x^2-10x-3=0

q u a d r a t i c f or m u l a 8 x^{2} - 10 x - 3 = 0

x^{2} - 3 x = - 20

1 0^{2} = 8^{2} + b^{2}