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受欢迎的代数 >

completesquare 10x^2-9x-9=0

解答

10 x^{2} - 9 x - 9 = 0

解答

x = \frac{3}{2}, x = - \frac{3}{5}

+1

十进制

x = 1.5, x = - 0.6

求解步骤

10 x^{2} - 9 x - 9 = 0

将

9

到右边

10 x^{2} - 9 x = 9

两边除以

10

\frac{10 x ^{2} - 9 x}{10} = \frac{9}{10}

x^{2} - \frac{9 x}{10} = \frac{9}{10}

改写为形式

(x + a)^{2} = b

(x - \frac{9}{20})^{2} = \frac{441}{400}

若

f^{2} (x) = a

，解为

f (x) = a, - a

解

x - \frac{9}{20} = \frac{441}{400} : x = \frac{3}{2}

解

x - \frac{9}{20} = - \frac{441}{400} : x = - \frac{3}{5}

二次方程组的解是:

x = \frac{3}{2}, x = - \frac{3}{5}

作图

流行的例子

(x + 5)^{2} = 7 (x + 5)

solvefor t,h=t^2+2t

so l v e f or t, h = t^{2} + 2 t

2 x^{2} - 9 = 12 x

v^{2} - 3 = - 16

X^{2} - 6 X + 2 = 0