Question 993994
{{{2^(2x+1)-15(2^x)=8}}}
=>{{{2*2^(2x)-15(2^x)=8}}}
=> {{{2y^2-15y-8=0}}} (Taking 2^x =y)
=> {{{(y-8)(2y+1)=0}}}
=> {{{y=8}}} or {{{y=-1/2}}}
=>{{{2^x=8}}} or {{{2^x= -1/2}}}
=> x=3 (Since 2^x can not be negative.)