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受欢迎的代数 >

8x^2-18-9=0

解答

8 x^{2} - 18 - 9 = 0

解答

x = \frac{3 3}{2 2}, x = - \frac{3 3}{2 2}

+1

十进制

x = 1.83711 \dots, x = - 1.83711 \dots

求解步骤

8 x^{2} - 18 - 9 = 0

将

18

到右边

8 x^{2} - 9 = 18

将

9

到右边

8 x^{2} = 27

两边除以

8

x^{2} = \frac{27}{8}

对于

x^{2} = f (a)

解为

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

x = \frac{27}{8}, x = - \frac{27}{8}

\frac{27}{8} = \frac{3 3}{2 2}

- \frac{27}{8} = - \frac{3 3}{2 2}

x = \frac{3 3}{2 2}, x = - \frac{3 3}{2 2}

作图

流行的例子

4 x^{2} + 27 x = 7

(x + 5)^{2} + 75 = 0

12 x^{2} = 5 + 4 x

x^{2} - 21 x + 4 = 0

completesquare-x^2+2x+5

co m pl e t es q u a re - x^{2} + 2 x + 5