Question

(2x-8)² = 9

Answer 1

\(\left(2x-8\right)=3\\ 2x=11\\ x=\dfrac{11}{2}\)

Answer 2

cần đáp án hay chi tiết?

 

Answer 3

\((2x-8)^2=9\)

\((2x-8)^2=3^2\)

\(=> 2x - 8 = 3\)

\(=> 2x=11\)

\(=>x=\dfrac{11}{2}\)

Vậy \(x=\dfrac{11}{2}\)

Answer 4

\(\left(2x-8\right)^2=9\)

\(\left(2x-8\right)^2=\pm\left(3\right)^2\)

\(\text{Vậy }2x-8=3\)

       \(2x\)        \(=8+3=11\)

        \(x\)         \(=11:2=\dfrac{11}{2}\)

\(\text{hoặc }2x-8=-3\)

         \(2x\)       \(=\left(-8\right)+3=5\)

          \(x\)        \(=5:2=\dfrac{5}{2}\)