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受欢迎的代数 >

x^2+18x-71=-8

解答

x^{2} + 18 x - 71 = - 8

解答

x = 3, x = - 21

求解步骤

x^{2} + 18 x - 71 = - 8

将

8

para o lado esquerdo

x^{2} + 18 x - 63 = 0

使用求根公式求解

x_{1, 2} = \frac{- 18 \pm 1 8 ^{2} - 4 \cdot 1 \cdot ( - 63 )}{2 \cdot 1}

1 8^{2} - 4 \cdot 1 \cdot (- 63) = 24

x_{1, 2} = \frac{- 18 \pm 24}{2 \cdot 1}

将解分隔开

x_{1} = \frac{- 18 + 24}{2 \cdot 1}, x_{2} = \frac{- 18 - 24}{2 \cdot 1}

x = \frac{- 18 + 24}{2 \cdot 1} : 3

x = \frac{- 18 - 24}{2 \cdot 1} : - 21

二次方程组的解是:

x = 3, x = - 21

作图

流行的例子

(k + 1) (k - 1) = 8

x^2+2/3 ax+(-(a^2)/2+1)=0

x^{2} + \frac{2}{3} a x + (- \frac{a ^{2}}{2} + 1) = 0

x(x-5)-4(3-x)=0

x (x - 5) - 4 (3 - x) = 0

1 = \frac{x ^{2}}{4}

completesquare x^2+20x+28=9

co m pl e t es q u a re x^{2} + 20 x + 28 = 9