solve 2^(2x+8) -8.2^(x+2) +1 =0
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2^(2x+8)-8 × 2^(x+2) = -1
=>(2^2x × 2^8) - 8 ×(2^x × 2²) = -1
=>256×4×2^x - 32 (2^x) = -1
=>32×2^x {32-1}=-1
=>2^x = -1/(32×31)
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