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受欢迎的代数 >

A=7x^2-3x+10

解答

A = 7 x^{2} - 3 x + 10

解答

x = \frac{3 + 28 A - 271}{14}, x = \frac{3 - 28 A - 271}{14}

求解步骤

A = 7 x^{2} - 3 x + 10

交换两边

7 x^{2} - 3 x + 10 = A

将

A

para o lado esquerdo

7 x^{2} - 3 x + 10 - A = 0

使用求根公式求解

x_{1, 2} = \frac{- ( - 3 ) \pm ( - 3 ) ^{2} - 4 \cdot 7 ( 10 - A )}{2 \cdot 7}

化简

(- 3)^{2} - 4 \cdot 7 (10 - A) : 28 A - 271

x_{1, 2} = \frac{- ( - 3 ) \pm 28 A - 271}{2 \cdot 7}

将解分隔开

x_{1} = \frac{- ( - 3 ) + 28 A - 271}{2 \cdot 7}, x_{2} = \frac{- ( - 3 ) - 28 A - 271}{2 \cdot 7}

x = \frac{- ( - 3 ) + 28 A - 271}{2 \cdot 7} : \frac{3 + 28 A - 271}{14}

x = \frac{- ( - 3 ) - 28 A - 271}{2 \cdot 7} : \frac{3 - 28 A - 271}{14}

二次方程组的解是:

x = \frac{3 + 28 A - 271}{14}, x = \frac{3 - 28 A - 271}{14}

作图

流行的例子

3 x^{2} - 16 x - 9 = 0

5 w^{2} - 30 w = 0

因式分解 12x^2-58x-10=0

f a c t or 12 x^{2} - 58 x - 10 = 0

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