sqrt(x^2+3x+5)=3

解答

x^{2} + 3 x + 5 = 3

x = 1, x = - 4

求解步骤

x^{2} + 3 x + 5 = 3

两边进行平方:

x^{2} + 3 x + 5 = 9

x^{2} + 3 x + 5 = 9

解

x^{2} + 3 x + 5 = 9 : x = 1, x = - 4

x = 1, x = - 4

验证解:

x = 1

真

, x = - 4

真

解为

x = 1, x = - 4

3 x + 28 - 3 x - 28 = 2

x + 4 + 2 x - 6 = 11

26 - 3 x = 5 x - 30

2 m - 6 = 3 m - 14

x + 3 - 7 - x = 2 x - 8