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受欢迎的代数 >

u=sqrt(4u+21)

解答

u = 4 u + 21

解答

u = 7

求解步骤

u = 4 u + 21

两边进行平方:

u^{2} = 4 u + 21

u^{2} = 4 u + 21

解

u^{2} = 4 u + 21 : u = 7, u = - 3

u = 7, u = - 3

验证解:

u = 7

真

, u = - 3

假

解是

u = 7

作图

流行的例子

sqrt((x-7)^2+(-1-5)^2)=7

(x - 7)^{2} + (- 1 - 5)^{2} = 7

sqrt(x)+2sqrt(3)=0

x + 23 = 0

sqrt(4x+37)=x+8

4 x + 37 = x + 8

c-2*sqrt(c)-0.59=0

c - 2 \cdot c - 0.59 = 0

x - 4 x + 1 = 0