|x+2|=3

解答

∣ x + 2 ∣ = 3

x = - 5 or x = 1

求解步骤

∣ x + 2 ∣ = 3

使用绝对值运算法则: 若

∣ u ∣ = a, a > 0

，则

u = a

u = - a

x + 2 = - 3 or x + 2 = 3

x + 2 = - 3 or x + 2 = 3

x = - 5 or x = 1

s im pl i f y \frac{- 2}{5 ^{2}}

\frac{2 x - 2}{3} = ∣ - 4 ∣

4 x^{2} - 4 x + 5 = 0

f a c t or 81 x^{2} + 18 x + 1

\frac{2 x - 5}{3} = \frac{3 x + 4}{2}