Question

Can you help me with this exercise please? 2^x+2^x-1+2^x-2=7 ( it's a exponential function) thanks

Answer 1

$2^{x}+ 2^{x-1}+ 2^{x-2} =7$
$2^{x}+ 2^{x} * frac{1}{2}+ x^{x}* frac{1}{4} =7$
$2^{x} *(1+ frac{1}{2}+ frac{1}{4} )=7$
$2^{x}=7: frac{7}{4} 2^{x}=4 2^{x} = 2^{2} x=2$