Question

7.2^3x-1 = 224

Answer 1

\(7.2^{3x-1}=224\)

\(\Rightarrow2^{3x-1}=224:7\)

\(\Rightarrow2^{3x-1}=32\)

\(\Rightarrow2^{3x-1}=2^5\)

\(\Rightarrow3x-1=5\)

\(\Rightarrow3x=5+1\)

\(\Rightarrow3x=6\)

\(\Rightarrow x=6:3\)

\(\Rightarrow x=2\)

Answer 2

=>2^3x-1=32

=>3x-1=5

=>3x=6

=>x=2

Answer 3

=>2^3x-1=32

=>3x-1=5

=>3x=6

=>x=2