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受欢迎的代数 >

(7x)^2-49=0

解答

(7 x)^{2} - 49 = 0

解答

x = 1, x = - 1

求解步骤

(7 x)^{2} - 49 = 0

展开

(7 x)^{2} - 49 : 49 x^{2} - 49

49 x^{2} - 49 = 0

将

49

到右边

49 x^{2} = 49

两边除以

49

x^{2} = 1

对于

x^{2} = f (a)

解为

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

x = 1, x = - 1

1 = 1

- 1 = - 1

x = 1, x = - 1

作图

流行的例子

2=0.013x^2-1.18x+28.24

2 = 0.013 x^{2} - 1.18 x + 28.24

(x - 6.25)^{2} = 3

4y^2-215y+2875=0

4 y^{2} - 215 y + 2875 = 0

solvefor x,a=x^2m+x^2n+x^2q

so l v e f or x, a = x^{2} m + x^{2} n + x^{2} q

16 x^{2} - 625 = 0