Question

  3^x + 3^x+2 = (-3)³ . (-10)

Mn giúp mik với ạ

Answer 1

\(3^x+3^{x+2}=\left(-3\right)^3.\left(-10\right)\\ \Leftrightarrow3^x+9.3^x=270\\ \Leftrightarrow10.3^x=270\\ \Leftrightarrow3^x=27\\ \Leftrightarrow3^x=3^3\\ \Leftrightarrow x=3\)

Answer 2

\(\Rightarrow3^x\left(1+3^2\right)=3^3\cdot10\\ \Rightarrow3^x\cdot10=3^3\cdot10\\ \Rightarrow x=3\)