(2\(^x\)-8)\(^3\)=(4\(^x\)+2\(^x\)+5)\(^3\)-(4\(^x\)+13)\(^3_{ }\)
(2\(^x\)-8)\(^3\)=[(4\(^x\)+2\(^x\)+5) - (4\(^x\)+13)].[(4\(^x\)... + (4\(^x\)+13)\(^2\)]
(2\(^x\) - 8)\(^3\) = (2\(^x\)-8).[(4\(^x\)+2\(^x\)+5)\(^2\)+(4\(^x\)+... + (4\(_{ }^x\)+13)\(^2\)]
2\(^x\) = 8 \(\Rightarrow\) x = 3
hoặc (2\(^x\)-8)\(^2\) = (4\(^x\)+2\(^x\)+5)\(^2\)+(4\(^x\)+2\(^x\)+5)(4\(^x\)+... + (4\(^x\)+13)\(^2\)
(4\(^x\)+2\(^x\)+5)\(^2\) - (2\(^x\)-8)\(^2\)+(4\(^x\)+2\(_{ }^x\)+5)(4\(^x\)+13) + (4\(^x\)+13)\(^2\) = 0
[(4^x+2^x+5)-(2^x-8)]*[(4^x+2^x+5)+(2^... + (4^x+3)*[(4^x+2^x+5)+(4^x+13)]=0
(4^x+13)*(4^x+2*2^x-3) + (4^x+3)*(2*4^x+2^x+18)=0
(4^x+13)[(4^x+2*2^x-3) + (2*4^x+2^x+18)]=0
4^x+13=0 (VN)
hoặc 3*4^x + 3*2^x +15=0
đặt t = 2\(^x\)( t > 0)
t\(^2\) + t + 5=0 ptvn
( Xin lỗi bạn , vì đoạn cuối mình mỏi tay nên ghi vậy đỡ nha ! (*) là dấu nhân nha bạn )
