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\(2^x+2^{x+3}=144\)
\(\Rightarrow2^x+2^x.2^3=144\)
\(\Rightarrow2^x.\left(1+2^3\right)=144\)
\(\Rightarrow2^x.9=144\)
\(\Rightarrow2^x=144:9\)
\(\Rightarrow2^x=16\)
\(\Rightarrow2^x=2^4\)
\(\Rightarrow x=4\)
Vậy x = 4
_Chúc bạn học tốt_
\(2^x+2^{x+3}=144\)
\(\Leftrightarrow2^x+2^x\cdot2^3=144\)
\(\Leftrightarrow2^x+2^x\cdot8=144\)
\(\Leftrightarrow2^x\left(1+8\right)=144\)
\(\Leftrightarrow2^x\cdot9=144\)
\(\Leftrightarrow2^x=144:9\)
\(\Leftrightarrow2^x=16\)
\(\Leftrightarrow2^x=2^4\)
\(\Leftrightarrow x=4\)
Vậy x=4
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2x + 2x+3 = 144
2x.(1+23) = 144
2x. 9 = 144
2x = 16 = 24
=> x = 4
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Ta có:
\(2^{x+3}+2^x=144\Rightarrow2^x.2^3+2^x=144\)
\(\Rightarrow2^x.\left(2^3+1\right)=144\Rightarrow2^x.9=144\)
\(\Rightarrow2^x=144:9\Rightarrow2^x=16\)
\(\Rightarrow2^x=2^4\Rightarrow x=4\)
2x+3 + 2x = 144
2x( 23 +1) = 144
2x . 9 = 144
2x = 16
2x = 24 => x=4
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2x+3 + 2x = 144
2x . 23 + 2x = 144
2x (8 + 1) = 144
2x . 9 = 144
2x = 144 : 9
2x = 16 = 24
x=4
=> 2.2^x = 144 - 3
=> 2^x+1 = 141
Vì 2^x+1 là số chẵn với x > 0
141 là số lẻ
=> 2^x+1 khác 141
VẬy không có x thỏa mãn
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2x + 3 + 2x = 144
2x.23 + 2x = 144
2x.(23 + 1) = 144
2x.9 = 24.9
x = 4
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\(2^x+2^{x+3}=144\)
\(\Leftrightarrow2^x\left(1+2^3\right)=144\)
\(\Leftrightarrow2^x=16\)
\(\Leftrightarrow x=4\)
\(2^x+2^{x+3}=144\)
\(2^x+2^x.2^3=144\)
\(2^x.\left(1+2^3\right)=144\)
\(2^x.9=144\)
\(2^x=16\)
\(2^x=2^4\)
\(\Rightarrow x=4\)
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\(2^x+2^x.2^3=144\)
\(\left(2^x.2\right).8=144\)
\(\left(2^x.2\right)=144:8=18\)
\(2^x.2=18\)
\(2^x=18:2=9\)
\(2^x=3^2\)
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\(\left(3x+3\right)^2=144\)
\(3x+3=\sqrt{144}\)
\(3x+3=12\)
\(3x=9\)
\(x=3\)
(3x+3)2=144=122
<=>3x+3=12 hoặc 3x+3=-12
<=>3x=9 hoặc 3x=-15
<=>x=3 hoặc x=-5
(x-3)2=144
=>(x-3)2=122
=>x-3=12
=>x=12+3
=>x=15
tick nha