Question

[vũ như quỳnh anh]

 2^x  +  2^x-3 =18

Answer 1

[Nguyễn Tấn Phát]

\(2^x+2^{x-3}=18\)

\(2^x+2^x:2^3=18\)

\(2^x+2^x.\frac{1}{2^3}=18\)

\(2^x.\left(1+\frac{1}{2^3}\right)=18\)

\(2^x.\frac{9}{8}=18\)

\(2^x=18:\frac{9}{8}\)

\(2^x=16=2^4\)

Vậy \(x=4\)

Answer 2

[🎉 Party Popper]

2^x + 2^x-3 = 18

<=> 2^x + 2^x : 2³ = 18

<=> 2^x + 2^x . \(\frac{1}{2^3}\)= 18

<=> 2^x(1 + \(\frac{1}{2^3}\)) = 18

<=> 2^x = 16

<=> 2^x = 2⁴

<=> x = 4