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受欢迎的代数 >

solvefor x,2x+sqrt(x+1)=8

解答

x, 2 x + x + 1 = 8

解答

x = 3

求解步骤

2 x + x + 1 = 8

去除平方根

x + 1 = 64 - 32 x + 4 x^{2}

解

x + 1 = 64 - 32 x + 4 x^{2} : x = \frac{21}{4}, x = 3

x = \frac{21}{4}, x = 3

验证解:

x = \frac{21}{4}

假

, x = 3

真

解是

x = 3

作图

流行的例子

x=2xsqrt(49-x^2)

x = 2 x 49 - x^{2}

sqrt(p)-2\sqrt[4]{p}-8=0

p - 2 4 p - 8 = 0

x + 1 = 3

2 x - 3 = 1

x + 34 = 40