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受欢迎的代数 >

x(2x)=1800

解答

x (2 x) = 1800

解答

x = 30, x = - 30

求解步骤

x (2 x) = 1800

化简

2 x^{2} = 1800

两边除以

2

\frac{2 x ^{2}}{2} = \frac{1800}{2}

x^{2} = 900

对于

x^{2} = f (a)

解为

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

x = 900, x = - 900

900 = 30

- 900 = - 30

x = 30, x = - 30

作图

流行的例子

(3x+2)^2+(x+4)^2=(2x+6)

(3 x + 2)^{2} + (x + 4)^{2} = (2 x + 6)

- 6 x^{2} + 10 x + 10 = 0

x = - 3 x^{2} + 3000 x

- b^{2} = 4 b - 20

x^{2} - 6 x + 20 = - 5