Question

Tìm x biết a) 2x -1/3=5/3 b) (2x+3)^2=25

Answer 1

a) \(2x-\dfrac{1}{3}=\dfrac{5}{3}\)

\(2x=\dfrac{5}{3}+\dfrac{1}{3}\)

\(2x=\dfrac{6}{3}=2\)

\(x=\dfrac{2}{2}=1\)

b) \(\left(2x+3\right)^2=25\)

\(\left(2x+3\right)^2=5^2\)

\(2x+3=5\)

\(2x=5-3=2\)

\(x=\dfrac{2}{2}=1\)

Answer 2

a)

\(2x-\dfrac{1}{3}=\dfrac{5}{3}< =>2x=2< =>x=1\)

b)

\(< =>\left(2x+3\right)^2=5^2< =>2x+3=5< =>2x=2< =>x=1\)