\(129-50x^2=-159\)
\(\Leftrightarrow50x^2=288\)
\(\Leftrightarrow x^2=\frac{144}{25}\)
\(\Leftrightarrow\left[\begin{array}{nghiempt}x=\frac{12}{5}\\x=-\frac{12}{5}\end{array}\right.\)
\(129-50x^2=-159\)
\(\Rightarrow50x^2=288\)
\(\Rightarrow x^2=\frac{144}{25}\)
\(\Rightarrow x=\frac{12}{5}\) hoặc \(x=\frac{-12}{5}\)
Vậy \(x=\frac{12}{5}\) hoặc \(x=\frac{-12}{5}\)
129 - 50x2 = -159
-50x2 = -159 - 129
-50x2 = -288
x2 = \(\frac{-288}{-50}\)
x2 = \(\frac{144}{25}\)
x = \(\sqrt{\frac{144}{25}}\)
x = \(\frac{12}{5}\)
129-50.x2=-159
50.x2 =129-(-159)
50.x2 =288
x2 =288:50
x2 =\(\frac{144}{25}\)
x=\(\sqrt{\frac{144}{25}}\)
x=\(\frac{12}{5}\)( Chúc cậu học tốt )
129 - 50x2 = -159
-50x2 = -159 - 129
-50x2 = -288
x2 = \(\frac{-288}{-50}\)
x2 = \(\frac{144}{25}\)
\(\Rightarrow\) \(\begin{cases}x=\sqrt{\frac{144}{25}}\\x=-\sqrt{\frac{144}{25}}\end{cases}\) \(\Rightarrow\) \(\begin{cases}x=\frac{12}{5}\\x=\frac{-12}{5}\end{cases}\)
