Question

\(^{\left(-7\right)^x}\)=\(\frac{1}{49}\)

tìm x nhé

Answer 1

\(\left(-7\right)^x.\left(-7\right)^2=1\)

\(\Rightarrow\left(-7\right)^{x+2}=1\)

\(\Rightarrow\left(-7\right)^{x+2}=\left(-7\right)^0\)

=>x+2=0

=>x=-2

Answer 2

\(\left(-7\right)^x=\frac{1}{49}\)

\(\left(-7\right)^x=\left(-7\right)^{-2}\)

\(x=-2\)