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受欢迎的代数 >

-8+81x^2=56

解答

- 8 + 81 x^{2} = 56

解答

x = \frac{8}{9}, x = - \frac{8}{9}

+1

十进制

x = 0.88888 \dots, x = - 0.88888 \dots

求解步骤

- 8 + 81 x^{2} = 56

将

8

到右边

81 x^{2} = 64

两边除以

81

x^{2} = \frac{64}{81}

对于

x^{2} = f (a)

解为

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

x = \frac{64}{81}, x = - \frac{64}{81}

\frac{64}{81} = \frac{8}{9}

- \frac{64}{81} = - \frac{8}{9}

x = \frac{8}{9}, x = - \frac{8}{9}

作图

流行的例子

3 x^{2} - 2 x + 1 = 4

x^{2} - 18 x + 16 = 0

solvefor x,x^2-8x+16=0

so l v e f or x, x^{2} - 8 x + 16 = 0

(x-4)^2+(x-1)*(x+1)=25

(x - 4)^{2} + (x - 1) \cdot (x + 1) = 25

x^{2} + 3 = - 24