Question

tìm x thuộc N

2\(^x\)*4=128

Answer 1

2^x*4=128

\(\Rightarrow2^x\cdot2^2=128\)

\(\Rightarrow2^{x+2}=128\)

\(\Rightarrow2^{x+2}=2^7\)

\(\Rightarrow x+2=7\)

\(\Rightarrow x=5\)

Answer 2

\(2^x\cdot4=128\)

\(2^x=\frac{128}{4}=32\)

\(2^x=2^5\)

\(\Rightarrow x=5\)