Question

(2x-5)² =49

Answer 1

(2x-5)²=49 = 7² = (-7)²

TH1: 2x - 5 = 7

=> 2x = 12

=> x = 6

TH2: 2x-5 = -7

=> 2x = -2

=> x = -1

Answer 2

\(\left(2x-5\right)^2=49\)

\(\left(2x-5\right)^2=7^2\)

\(\Rightarrow2x-5=7\)

\(\Rightarrow2x=7+5\)

\(\Rightarrow2x=12\)

\(\Rightarrow x=12:2\)

\(\Rightarrow x=6\)

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Answer 3

Ngọc Nguyễn Minh 49 = (-7)² nữa cơ mà

Answer 4

(2x-5)²=49 = 7² = (-7)²

Nếu 2x - 5 = 7

=> 2x = 12

=> x = 6

Nếu 2x-5 = -7

=> 2x = -2

=> x = -1