x2 -1 = 49
x2=50
x=\(5\sqrt{2}\)
x mũ 2-1=49
x mũ 2 = 49+1
x mũ 2 =50
.... tự lm
x2-1=49
x2=50
x=\(5\sqrt{2}\)
hok tốt
\(x^2-1=49\)
\(\orbr{\begin{cases}x=-\sqrt{50}\\x=\sqrt{50}\end{cases}}\)
x^2-1=49
x^2 =49+1
x^2 =50
=>x =5\(\sqrt{2}\)
x2 -1 = 49
x2 = 49+1
x2 = 50
=>x = \(5\sqrt{2}\)