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受欢迎的代数 >

w^2-8w+7=-3

解答

w^{2} - 8 w + 7 = - 3

解答

w = 4 + 6, w = 4 - 6

+1

十进制

w = 6.44948 \dots, w = 1.55051 \dots

求解步骤

w^{2} - 8 w + 7 = - 3

将

3

para o lado esquerdo

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

使用求根公式求解

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

(- 8)^{2} - 4 \cdot 1 \cdot 10 = 26

w_{1, 2} = \frac{- ( - 8 ) \pm 2 6}{2 \cdot 1}

将解分隔开

w_{1} = \frac{- ( - 8 ) + 2 6}{2 \cdot 1}, w_{2} = \frac{- ( - 8 ) - 2 6}{2 \cdot 1}

w = \frac{- ( - 8 ) + 2 6}{2 \cdot 1} : 4 + 6

w = \frac{- ( - 8 ) - 2 6}{2 \cdot 1} : 4 - 6

二次方程组的解是:

w = 4 + 6, w = 4 - 6

作图

流行的例子

x^2-13x-11=-7x+5

x^{2} - 13 x - 11 = - 7 x + 5

6 x^{2} + 19 x + 10 = 0

4 - 12 x^{2} = 0

2 x^{2} - 12 x + 13 = 0

2 x^{2} + 6 x - 7 = 0