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受欢迎的代数 >

29^2=21^2+x^2

解答

2 9^{2} = 2 1^{2} + x^{2}

解答

x = 20, x = - 20

求解步骤

2 9^{2} = 2 1^{2} + x^{2}

交换两边

2 1^{2} + x^{2} = 2 9^{2}

将

2 1^{2}

到右边

x^{2} = 400

对于

x^{2} = f (a)

解为

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

x = 400, x = - 400

400 = 20

- 400 = - 20

x = 20, x = - 20

作图

流行的例子

- 5 x^{2} + 20 x + 25 = 0

x^{2} - 24 x + 20 = 0

x^{2} + (- 2) x + 1 = 0

-0.001x^2+250=0.0006x^2+0.02x+100

- 0.001 x^{2} + 250 = 0.0006 x^{2} + 0.02 x + 100

B = x^{2} + 3 x + 1