Question

4 mu x = 4mu3 × 4mu5

 

2mux = 8× 128

Answer 1

\(4^x=4^3.4^5\Rightarrow x=3+5=8\)

\(2^x=8.128\Rightarrow2^x=2^3.2^7\Rightarrow x=3+7=10\)

Answer 2

\(4^X=4^3.4^5\)

\(4^X\)=\(4^7\)

\(\Rightarrow\)X=7

\(2^X=8.128\)

\(2^X=2^3.2^7\)

\(2^X\)=\(2^{10}\)

\(\Rightarrow\)x=10

chú ý: dấu nhân kí hiệu là .

Answer 3

4^x=4³.4⁵

4^x=4³⁺⁵

4^x=4⁸

<=> x=8

2^x=8.128

2^x=2³.2⁷

2^x=2³⁺⁷

2^x=2¹⁰

<=> x=10