Question

4^x+2.5.4^x=1280

Answer 1

\(4^{x+2}.5.4=1280\Leftrightarrow4^{x+2}=\frac{1280}{5.4}\Leftrightarrow4^{x+2}=64\Leftrightarrow4^{x+2}=4^3\)

\(\Rightarrow x+2=3\Leftrightarrow x=3-2\Leftrightarrow x=1\)

Answer 2

4^x+2.5.4=1280

4^x+2.20=1280

4^x+2     =1280:20

4^x.4² =64

4^x.16=64

4^x  =64:16

4^x=4

=>x=1

Answer 3

giúp mình câu này luôn ạ 
4^x+2.5.4^x=1280

Answer 4

4^x+2.5=1280:4

4^x+2.5=320

4^x+2=320:5

4^x+2=64

(4^x).(4²)=64

4^x.16=64

4^x=64:16

4^x=4

4¹=4

x=1

Answer 5

4×+2 .5.4× = 1280 <=> 4× .16.5.4× = 1280 <=> 4^2x .80 = 1280 <=> 4^2x = 1280:80 <=> 4^2x = 16 <=> 4^2x = 4² => 2x = 2 => X= 1