Question

3 mũ 2 nhân ( x + 4 ) - 5 mũ 2 = 5 nhân 5 mũ 2

 

Answer 1

3² \(\times\) ( \(x\) + 4) - 5² = 5.5²

9.(\(x\) + 4) - 25 = 125

9.(\(x\) + 4) = 150

    \(x\) + 4 =  \(\dfrac{50}{3}\)

     \(x\)       =  \(\dfrac{50}{3}\) - 4

     \(x\)      = \(\dfrac{38}{3}\)

Answer 2

\(3^2\cdot\left(x+4\right)-5^2=5\cdot5^2\\ \Leftrightarrow9\left(x+4\right)=6\cdot5^2\\ \Leftrightarrow x+4=\dfrac{50}{3}\\ \Leftrightarrow x=\dfrac{38}{3}\)