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受欢迎的代数 >

(x-1)(x+1)=2(x^2-3)

解答

(x - 1) (x + 1) = 2 (x^{2} - 3)

解答

x = 5, x = - 5

+1

十进制

x = 2.23606 \dots, x = - 2.23606 \dots

求解步骤

(x - 1) (x + 1) = 2 (x^{2} - 3)

展开

(x - 1) (x + 1) : x^{2} - 1

展开

2 (x^{2} - 3) : 2 x^{2} - 6

x^{2} - 1 = 2 x^{2} - 6

将

1

到右边

x^{2} = 2 x^{2} - 5

将

2 x^{2}

para o lado esquerdo

- x^{2} = - 5

两边除以

- 1

x^{2} = 5

对于

x^{2} = f (a)

解为

x = f (a), - f (a)

x = 5, x = - 5

作图

流行的例子

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s im pl i f y (\frac{8}{125})^{- \frac{4}{3}}

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9 x - 1 < \frac{3}{4} (16 x - 2)

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